Five people have been killed and three injured in a shooting at a house party near Pittsburgh on Wednesday night.

Allegheny County Police said they are still searching for two gunmen, who carried out the attack around 11pm.

Four of the victims — three women and one man — were found dead at the scene, officials said in a press release. A fourth woman was transported to University of Pittsburgh Medical Center Mercy, where she later died.

Lieutenant Andrew Schurman of Allegheny County homicide unit said the gunmen barged into the party and opened fire in an ambush-style attack.

Ballistic evidence suggested that two weapons were discharged from separate people who opened fire at the rear of the home, police said.

Tina Shelton, 38, was identified as one victim who died at the scene. Her father Vernes Pugh said she was the mother of five children, WPXI-TV reports.

Kayla Alexandra, a witness who lives nearby, told the station that she heard “at least 20 shots.”