An attacker with a large kitchen knife killed two people and wounded six others in stabbings along the Las Vegas Strip before being arrested Thursday, police said.Three people were hospitalized in critical condition and another three were in stable condition, according to Las Vegas police who said they began receiving 911 calls about the stabbings around 11:40 a.m. on the north end of the Strip.Authorities said the suspect identified himself to police and they are working to determine his “true identity.” They described him as Hispanic and in his 30s, and said he does not appear to be a Las Vegas resident.Clark County Sheriff Joe Lombardo said the names of the two people killed were being withheld until their relatives can be notified.“Locals and tourists are the victims of this crime,” Lombardo said at a news conference.Metro Police Deputy Chief James LaRochelle said the initial stabbing was unprovoked and on the eastern sidewalk of Las Vegas Boulevard. He said the suspect then headed south and stabbed others.Video below: Police provide update on Las Vegas stabbingsThe man fled and was followed by 911 callers before he was taken into custody, authorities said. Police recovered the “large knife with a long blade” believed to have been used, LaRochelle said, calling the case a “hard-to-comprehend murder investigation.”Lombardo said there were no other suspects in the case and “the Strip is secure.”Police said it was too early in their investigation to speculate on a possible motive for the stabbings.Witnesses told Las Vegas TV stations that some of the victims appeared to be showgirls or street performers who take pictures with tourists on the Strip.The suspect told a woman that he was a chef who wanted to take a picture with some of the showgirls with his knife, but he started stabbing people when the group declined the man's offer, the woman told KTNV.Pierre Fandrich, a tourist from Canada, told KTNV that he did not see the stabbing suspect as he was walking along the Strip. But he said he thought he heard “three or four showgirls laughing,” although it turned out to be screaming.Fandrich said he saw “a lot of blood” as one woman ran across the bridge, one was on the ground, and another had a stab wound on her back as she tried to help the fallen woman.Fandrich also told KTNV that he thought one of the victims fell from the bridge because there was so much blood on the ground. This story will be updated. Refresh this page for the latest.

Three days after the arrest of a suspect in the fatal stabbing of four University of Idaho students, authorities have yet to release key details in the case, from whether the suspect knew the victims to what his alleged motive might have been and what finally prompted his arrest.The arrest of Bryan Christopher Kohberger, 28, came almost seven weeks after Kaylee Goncalves, 21; Madison Mogen, 21; Xana Kernodle, 20; and Ethan Chapin, 20, were found dead Nov. 13 in an off-campus home.The killings shook the college town of Moscow, Idaho, which hadn't seen a murder in seven years, as some in the community grew frustrated with the limited information authorities shared as their investigation developed.That was partly due to state law, which limits what information authorities can release before the suspect makes an initial appearance in court, Moscow Police Chief James Fry said Friday, the day authorities announced Kohberger's arrest in his home state of Pennsylvania.And the probable cause affidavit — the legal document used to justify Kohberger's arrest and obtain a warrant — remains sealed until he is returned to Idaho, where he faces four counts of first-degree murder as well as a felony burglary charge, per Latah County, Idaho, prosecutors.That document, "will tell us an awful lot," said CNN legal analyst and criminal defense attorney Joey Jackson. "It will speak to the issue of probable cause -- why is he under arrest, what is the justification for holding him and for going after him from a prosecution perspective."Kohberger is due in court Tuesday, when his attorney has indicated the suspect would waive extradition. The chief public defender for Monroe County, Pennsylvania, expected Kohberger to be returned to Idaho within 72 hours of Tuesday's hearing, the attorney has said.Kohberger's parents and two sisters plan to attend Tuesday's hearing, public defender Jason LaBar told CNN Monday. They will not be permitted to visit him while they're there.Until then, here are a few of the key details that remain unknown.The suspect's relationship to the victimsAuthorities have not said publicly whether Kohberger knew any of the victims, who all were found dead hours after a Saturday night out: Chapin and Kernodle had attended a party on campus earlier that night, police have said, while Mogen and Goncalves went to a downtown bar before ordering food at a late-night food truck.Kohberger lived in the area, Fry indicated Friday: He was a Ph.D. student in the criminal justice program at Washington State University's campus in Pullman, about a 15-minute drive west of Moscow.Kohberger was a graduate student at the school, Washington State University confirmed in a statement last week, adding the school's police department helped Idaho law enforcement execute search warrants at Kohberger's campus apartment and his office.There also was law enforcement activity Friday at a Pullman apartment complex where graduate students live, a CNN team observed.Meanwhile, DNA played a role in the investigation, sources have indicated to CNN.Investigators focused on Kohberger as a suspect, in part, after his DNA was matched to genetic material recovered at the home where the students were slain, two law enforcement sources briefed on the investigation have said.Genetic genealogy techniques were used to connect Kohberger to unidentified DNA evidence, a source with knowledge of the case told CNN. The DNA was run through a public database to find potential family member matches, and subsequent investigative work by law enforcement led to his identification as the suspect, the source said.Information about Kohberger's DNA and any prior relationship with the victims are both key pieces of evidence, Jackson told CNN on Monday."No. 1: I'm looking for DNA," he said. "Was his DNA (in the residence)? ... Is there any reason to explain the DNA, is there a basis to know or understand why he would be there?""Which leads me to No. 2," Jackson said: "Is there any pre-existing relationship? Did he know them? If so, how?"The suspect's alleged motiveInvestigators also have yet to give any indication of why Kohberger allegedly carried out the stabbings.In the days since his arrest, there has been a heavy focus Kohberger's study of criminal justice and criminology as a Washington State University student — a detail a former senior FBI profiler called "very interesting.""We have had other cases where offenders have been in areas of study that more or less prepare them to commit a crime," Mary Ellen O'Toole told CNN on Sunday. If he is guilty, Kohberger's "area of study is not a result of cause and effect," she stressed, noting studying the criminal mind did not "cause him to do this.""He's interested in this, but the ideation of committing a violent crime had to already be there in order to motivate him to commit the crime," O'Toole said. "So, this was kind of a conduit to explore what he was already interested in doing."Kohberger was previously an undergraduate and graduate student at DeSales University, a Catholic university in Pennsylvania, according to a statement from the school. He graduated with a bachelor's degree in 2020 and this year completed his "graduate studies for the Master of Arts in criminal justice program," according to a university spokesperson.In a post removed from Reddit after his arrest was announced, a student investigator associated with a DeSales University study named Bryan Kohberger sought participation in a research project "to understand how emotions and psychological traits influence decision-making when committing a crime.""In particular," it read, "this study seeks to understand the story behind your most recent criminal offense, with an emphasis on your thoughts and feelings throughout your experience."Last month, Kohberger finished his first semester as a Ph.D. student at Washington State University, the school confirmed.How the suspect stayed free for 7 weeksIt's also unclear why Kohberger wasn't arrested until more than six weeks after the victims were found dead. Fry would not reveal Saturday when Kohberger came onto law enforcement's radar, saying details in the case would be released in time.Kohberger went home to Pennsylvania for the holidays, LaBar told CNN on Saturday, adding the suspect and his father — who accompanied his son on the cross-country drive — arrived around Dec. 17.A white Hyundai Elantra authorities had been looking for in connection with the killings was found at Kohberger's parents' house, LaBar confirmed.The suspect drove the car to his parents' house, according to another law enforcement source, who told CNN, "Sometime right before Christmas we were zeroing in on him being in or going to Pennsylvania."An FBI surveillance team from the Philadelphia field office had been tracking him for four days in the area where he was arrested, according to two law enforcement sources briefed on the investigation.While Kohberger was being watched, investigators from the Moscow Police Department, the Idaho State Police homicide bureau and the FBI worked with prosecutors to develop sufficient probable cause to get the warrant. Once the arrest warrant was issued, the Pennsylvania State Police and the FBI made the arrest.Authorities continue to ask the public for information. Within an hour of announcing the arrest, Fry told CNN, authorities got roughly 400 calls."We want information on that individual," Fry said Saturday. "We want that updated information so that we can start building that picture now. Every tip matters."

Three days after the arrest of a suspect in the fatal stabbing of four University of Idaho students, authorities have yet to release key details in the case, from whether the suspect knew the victims to what his alleged motive might have been and what finally prompted his arrest.

The arrest of Bryan Christopher Kohberger, 28, came almost seven weeks after Kaylee Goncalves, 21; Madison Mogen, 21; Xana Kernodle, 20; and Ethan Chapin, 20, were found dead Nov. 13 in an off-campus home.

The killings shook the college town of Moscow, Idaho, which hadn't seen a murder in seven years, as some in the community grew frustrated with the limited information authorities shared as their investigation developed.

That was partly due to state law, which limits what information authorities can release before the suspect makes an initial appearance in court, Moscow Police Chief James Fry said Friday, the day authorities announced Kohberger's arrest in his home state of Pennsylvania.

And the probable cause affidavit — the legal document used to justify Kohberger's arrest and obtain a warrant — remains sealed until he is returned to Idaho, where he faces four counts of first-degree murder as well as a felony burglary charge, per Latah County, Idaho, prosecutors.

That document, "will tell us an awful lot," said CNN legal analyst and criminal defense attorney Joey Jackson. "It will speak to the issue of probable cause -- why is he under arrest, what is the justification for holding him and for going after him from a prosecution perspective."

N/A

Kohberger is due in court Tuesday, when his attorney has indicated the suspect would waive extradition. The chief public defender for Monroe County, Pennsylvania, expected Kohberger to be returned to Idaho within 72 hours of Tuesday's hearing, the attorney has said.

Kohberger's parents and two sisters plan to attend Tuesday's hearing, public defender Jason LaBar told CNN Monday. They will not be permitted to visit him while they're there.

Until then, here are a few of the key details that remain unknown.

The suspect's relationship to the victims

Authorities have not said publicly whether Kohberger knew any of the victims, who all were found dead hours after a Saturday night out: Chapin and Kernodle had attended a party on campus earlier that night, police have said, while Mogen and Goncalves went to a downtown bar before ordering food at a late-night food truck.

Kohberger lived in the area, Fry indicated Friday: He was a Ph.D. student in the criminal justice program at Washington State University's campus in Pullman, about a 15-minute drive west of Moscow.

Kohberger was a graduate student at the school, Washington State University confirmed in a statement last week, adding the school's police department helped Idaho law enforcement execute search warrants at Kohberger's campus apartment and his office.

Obtained by CNN

There also was law enforcement activity Friday at a Pullman apartment complex where graduate students live, a CNN team observed.

Meanwhile, DNA played a role in the investigation, sources have indicated to CNN.

Investigators focused on Kohberger as a suspect, in part, after his DNA was matched to genetic material recovered at the home where the students were slain, two law enforcement sources briefed on the investigation have said.

Genetic genealogy techniques were used to connect Kohberger to unidentified DNA evidence, a source with knowledge of the case told CNN. The DNA was run through a public database to find potential family member matches, and subsequent investigative work by law enforcement led to his identification as the suspect, the source said.

Information about Kohberger's DNA and any prior relationship with the victims are both key pieces of evidence, Jackson told CNN on Monday.

"No. 1: I'm looking for DNA," he said. "Was his DNA (in the residence)? ... Is there any reason to explain the DNA, is there a basis to know or understand why he would be there?"

"Which leads me to No. 2," Jackson said: "Is there any pre-existing relationship? Did he know them? If so, how?"

The suspect's alleged motive

Investigators also have yet to give any indication of why Kohberger allegedly carried out the stabbings.

In the days since his arrest, there has been a heavy focus Kohberger's study of criminal justice and criminology as a Washington State University student — a detail a former senior FBI profiler called "very interesting."

"We have had other cases where offenders have been in areas of study that more or less prepare them to commit a crime," Mary Ellen O'Toole told CNN on Sunday. If he is guilty, Kohberger's "area of study is not a result of cause and effect," she stressed, noting studying the criminal mind did not "cause him to do this."

"He's interested in this, but the ideation of committing a violent crime had to already be there in order to motivate him to commit the crime," O'Toole said. "So, this was kind of a conduit to explore what he was already interested in doing."

Kohberger was previously an undergraduate and graduate student at DeSales University, a Catholic university in Pennsylvania, according to a statement from the school. He graduated with a bachelor's degree in 2020 and this year completed his "graduate studies for the Master of Arts in criminal justice program," according to a university spokesperson.

In a post removed from Reddit after his arrest was announced, a student investigator associated with a DeSales University study named Bryan Kohberger sought participation in a research project "to understand how emotions and psychological traits influence decision-making when committing a crime."

"In particular," it read, "this study seeks to understand the story behind your most recent criminal offense, with an emphasis on your thoughts and feelings throughout your experience."

Last month, Kohberger finished his first semester as a Ph.D. student at Washington State University, the school confirmed.

How the suspect stayed free for 7 weeks

It's also unclear why Kohberger wasn't arrested until more than six weeks after the victims were found dead. Fry would not reveal Saturday when Kohberger came onto law enforcement's radar, saying details in the case would be released in time.

Kohberger went home to Pennsylvania for the holidays, LaBar told CNN on Saturday, adding the suspect and his father — who accompanied his son on the cross-country drive — arrived around Dec. 17.

A white Hyundai Elantra authorities had been looking for in connection with the killings was found at Kohberger's parents' house, LaBar confirmed.

The suspect drove the car to his parents' house, according to another law enforcement source, who told CNN, "Sometime right before Christmas we were zeroing in on him being in or going to Pennsylvania."

An FBI surveillance team from the Philadelphia field office had been tracking him for four days in the area where he was arrested, according to two law enforcement sources briefed on the investigation.

While Kohberger was being watched, investigators from the Moscow Police Department, the Idaho State Police homicide bureau and the FBI worked with prosecutors to develop sufficient probable cause to get the warrant. Once the arrest warrant was issued, the Pennsylvania State Police and the FBI made the arrest.

Authorities continue to ask the public for information. Within an hour of announcing the arrest, Fry told CNN, authorities got roughly 400 calls.

"We want information on that individual," Fry said Saturday. "We want that updated information so that we can start building that picture now. Every tip matters."

Officials in Davis, California, have lifted an overnight shelter-in-place order after they were unable to find a suspect in a knife attack late Monday -- the third such incident following two fatal stabbings in less than a week near the campus of the University of California, Davis.The startling advice for students not to venture out following Monday's stabbing, which left a woman in critical condition. That attack was preceded by the killings Saturday evening of a UC Davis senior and Thursday of a 50-year-old man at different parks near campus. About 40,000 students are enrolled at the public university in Davis, a city of some 68,000 people about a 20-minute drive west of the state capital, Sacramento.Authorities in Davis, California are searching for a suspect after three people were stabbed in less than a week in the city.Two people died, and one woman is in critical condition in the incidents that have shaken the small university town. Video above: Witnesses say their friend was stabbed by Davis attackerThe city sent out an alert to residents around 12:30 a.m. on Tuesday calling for a shelter in place. That shelter-in-place has since been lifted but police have yet to find the suspect, whose description now matches the assailant in two of the recent stabbings.Here’s everything we know about the stabbings right now:Who was killed?On April 27, David Breaux was identified as the man who was stabbed to death in Davis’ Central Park. Breaux was a well-known community member and a positive presence around town, often referred to as the "Compassion Guy" for asking others about their definition of "compassion."A message from the Davis mayor, police chief and other city officials said that Breaux was a Stanford graduate who was "instrumental" in the addition of a "Compassion Bench" at the corner of 3rd and C Streets in 2013. Two days later, Karim Abou Najm, a 20-year-old UC Davis student, was stabbed and killed at Davis’ Sycamore Park while going home from an undergraduate awards ceremony. The student was studying computer science and was set to graduate in six weeks, according to his father, Majdi Abou Najm, who also said his son already had two jobs lined up for after graduation."We moved from Lebanon in 2018 when the situation in Lebanon was a little bit starting to go in not the right direction," Abou Najm said. "We came here hoping for safety." Who was hurt?A 64-year-old woman who has not been identified was stabbed the night of May 1 at a homeless encampment in Davis on 2nd and L streets. Video above: Chief of police at UC Davis speaks out on deadly stabbingsThe woman was found after a 911 call, and she told authorities she had been stabbed more than once through a tent. She was taken to a nearby hospital in critical condition and has undergone surgery. Witness Christine Barrios said that their friend was the woman who was stabbed and that the victim had thought at first that she had been punched.Where did the stabbings happen?Breaux was stabbed and killed at Davis’ Central Park. Najm was stabbed and killed at Davis’ Sycamore Park. The third person, an unidentified woman, was stabbed in the area of 2nd and L streets.Are the incidents related? Is this a serial killer?Police said it is possible the stabbings are connected. In at least two of the stabbings, a description of the suspect was similar. Do authorities have any leads on a suspect?Authorities are looking for a man with a light complexion, curly hair, 5 feet and 6 inches to 5 feet and 9 inches tall, and a thin build. He is believed to be wearing a black or blue sweatshirt, black Adidas pants with stripes and carrying a brown backpack.A similar description was issued for the suspect in the stabbing death of Abou Najm. Who is investigating the stabbings?The FBI has been called in to help with the investigation into stabbings."We're a small agency and we're working around the clock with the personnel that we have now. I have detectives sleeping under their desks for a couple of hours, staying away from their families," Dan Beckwith with Davis police said on Monday. Are there any increased safety protocols for UC Davis students?As an added precaution, the university said it is increasing escort availability for its Safe Ride program for students.Video above: UC Davis students concerned for safety following deadly stabbings Those rides from campus into the city will now be available from 8 p.m. to 3 a.m. daily, according to the university. CNN contributed to this report.