Police say five people have been killed in a shooting at a Pittsburgh, Pennsylvania suburb and at least two gunmen are still at large.
Allegheny County police say four women and a man were killed late on Wednesday during a backyard party in Wilkinsburg. At least three others are in stable or critical condition at hospitals.
No suspects are in custody. A motive wasn't immediately known.
Lt. Andrew Schurman of the Allegheny County homicide unit says the gunmen barged into the party and opened fire in an ambush-style attack.
The shooters fled after the ambush and are still at large, the news station WPXI said.
Resident Kayla Alexander tells WPXI-TV that she heard a barrage of gunshots more than 20 in the neighbourhood which is usually quiet.
Groups of residents gathered on the street, some of them sobbing and saying they lost family members.
Four people were declared dead at the scene of Wednesday's attack, said Lieutenant Andrew Schurman of the Allegheny County Police Department.
Four more victims were taken to nearby hospitals, but one died from her wounds. The other three were in critical or stable condition, Schurman said.
Dozens of shell casings littered the pavement of an alleyway near the site, where police were gathering evidence and talking to witnesses, media reports said.
The attack came only one day after Pennsylvania gun control advocates asked the state's top court to knock down a 2014 law allowing gun-rights lobbying groups to sue cities that adopt gun restrictions and recoup legal costs if they prevail. Firearms advocates, including the National Rifle Association, contend the law is necessary to prevent gun owners from becoming ensnared by a patchwork of municipal ordinances that violate their right to bear arms.