KABUL, Afghanistan — A Taliban official says an explosion has gone off in front of a military hospital in Kabul, causing casualties.

A spokesperson for the Taliban-run Interior Ministry wrote in a tweet that Tuesday's blast went off at one of the gates to the Sardar Mohammad Dawood Khan military hospital.

The spokesperson said the number of casualties was not immediately known and that special forces were at the scene.

Kabul residents had heard two explosions in the area and also reported the sound of gunfire.

The blast is just the latest deadly explosion in Afghanistan since Taliban forces overtook the U.S.-backed government as the American military began its withdrawal in August.

Days before completing the withdrawal, a suicide bombing by a suspected ISIS terrorist at the gates of Kabul's airport killed more than 100 people, including 13 U.S. service members.

Last month, a bombing at a Shiite mosque killed at least 47 people and left 70 others wounded.

Emal Ahmadi knew his brother Zamarai wasn't the ISIS-K facilitator that American officials portrayed him to be in the days after his death. Now, at last, the whole world knows that too.Zamarai Ahmadi and nine other civilians, including seven children, were killed in a U.S. airstrike in Kabul on Aug. 29. For nearly three weeks, U.S. officials kept insisting the strike was "righteous" and that at least one ISIS-K facilitator was killed.On Friday, the Pentagon admitted it was a tragic mistake. Zamarai Ahmadi, a 43-year-old technical engineer at Nutrition and Education International, a U.S. nonprofit, had no ties with ISIS-K.Emal Ahmadi told CNN that while the acknowledgment by the U.S. that his older brother was a victim and not a terrorist brought the family some solace, they are still struggling to understand what happened."The U.S. that inside this area, inside the car, children, why they target innocent in this area?" he asked.His daughter Malika was killed in the attack alongside her uncle, her seven cousins and another child. She was just two years old."They are, all of them, innocent, like my cute daughter ... she was so lovely," Emal Ahmadi said.He spoke to CNN inside the damaged family home, a two-story house in a tidy Kabul neighborhood that Zamarai Ahmadi shared with his three brothers and their wives and children. The green metal gate, pierced through with shrapnel three weeks ago, is now guarded by the Taliban. On the streets outside, children are playing.No one has cleaned the site or removed the debris still scattered around the compound. The burnt skeleton of a white Toyota Corolla, the target of the drone strike, is still in the middle of the yard, its roof blown off. Several of the children were in the car when the missile hit, the family said. Their little sandals, charred and deformed by the heat of the explosion, lying on top of the debris.On the kitchen counter upstairs, two potatoes, a knife and bright red spice rest prepared next to the cooking pot. A reminder of a family dinner that never happened.Emal Ahmadi said no U.S. officials have reached out to the family directly.US Secretary of Defense Lloyd J. Austin III has offered his condolences in a statement issued on Friday, calling Ahmadi an "innocent victim" whose activities were "completely harmless." "We apologize, and we will endeavor to learn from this horrible mistake," he said.Gen. Frank McKenzie, commander of U.S. Central Command, said the Pentagon was considering reparations payments to the family and said that while it was "very difficult" to reach out to people "on the ground in Afghanistan," they will be attempting to do so.When asked what they want from the U.S., Emal Ahmadi and his brother Romal, whose three children -- Aayat, 2, Binyamen, 6, and Armin, 7 -- were also killed in the strike, said "justice."At a dusty Kabul cemetery where his children, brother and other family members were laid to rest just a few weeks ago, Romal Ahmadi told CNN he wants the drone operators to be tried for the killings in court.The family had to borrow money to pay for the funerals, there were so many at one time they couldn't afford to pay from their own pocket.Asked whether he could ever forgive the U.S. for what happened, Emal Ahmadi said "maybe.""But how should I do ... I lost my family ... no one is able to return them back," he said.