BALTIMORE —

As many as 30 people were shot in a mass shooting overnight in Baltimore, Maryland, police said.

Baltimore Police Department Acting Commissioner Rich Worley said officers received multiple calls just after 12:30 a.m. for a mass shooting in the Brooklyn neighborhood, where there was a block party underway.

Worley said officers found an 18-year-old woman dead at the scene. Nine others were taken to hospitals, and as many as 20 others arrived at hospitals across the region on their own.

A 20-year-old man also died, and three others were in critical condition.

Worley said a suspect is not in custody, but that investigators were reviewing video and talking to witnesses to try to identify a suspect. Baltimore Mayor Brandon Scott implored the public to provide information.

"This is an absolute tragedy that did not have to happen," Scott said. "Anyone that knows anything about what happened here, anything about this mass shooting, to come forward with any piece of information. Treat this as if it was your family and how you would want people to treat it as as if you were mourning, as if this were an event happening in your community."

Residents told our sister station WBAL TV there was a large gathering in the neighborhood before they heard what sounded like fireworks, which they later learned were gunshots.

No further information was immediately released.

This report will be updated.

Raw video below: Police news conference in its entirety

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