Five people are dead after a shooting at a home in Wilkinsburg, Pa., according to Allegheny County Police. Investigators believe there were multiple gunmen involved, but no one is in custody.
Police got reports of the shooting at about 11 p.m. ET in the backyard of a house where there was some sort of cookout or "backyard party," Lt. Andrew Sherman says.
"This street is always quiet. There's nothing but kids on this street," one woman told CNN affiliate WPXI.
The dead include four women, one of who died at the hospital, and a man. Three other people are hospitalized; two of them, both men, are in critical condition. One woman is in "stable condition," according to Sherman. None of the victims' names have been released.
Authorities believe there were two gunmen -- both on foot -- based on ballistic evidence.
First, shots were fired from an alley behind the home into the backyard. People then tried to run inside through the back door, when someone either on the side or adjacent to residence fired into the back porch. All four who died on the scene were found on that porch.
Wilkinsburg is a borough of Allegheny County, east of Pittsburgh.