Washington: At least five people were killed and three others were injured after gunmen opened fire at a home in Pennsylvania on late Wednesday night.
According to reports, the incident took place in a residential neighbourhood in the Wilkinsburg borough of Allegheny county. Four people including three women and a man were dead at the scene, and one woman was pronounced dead at a local hospital.
A senior police official told the media that a "backyard party" was underway at the time of the shooting.
Investigators found ballistic evidence from two weapons and believe at least two gunmen were involved, NBC News reported.
No suspects are in custody and motive of the attack is still unknown.
The three injured have been hospitalized and two of them are in critical condition.