The Latest on a deadly shooting at a backyard party in a Pittsburgh suburb (all times local):

10:05 a.m.

A county official is urging witnesses to come forward in a shooting at a backyard party that left five people dead and three wounded in suburban Pittsburgh.

Four women and a man were killed late Wednesday during the party in Wilkinsburg. Two others are in critical condition.

Allegheny County Executive Rich Fitzgerald says if violence is to be stopped, witnesses need to come forward.

Fitzgerald says "we must say enough is enough."

Police are searching for at least two suspects who they say opened fire in an ambush-style attack.

The motive is not known.

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6:45 a.m.

Police are searching for at least two suspects in a shooting at a backyard party that left five people dead and three wounded in suburban Pittsburgh.

Four women and a man were killed late Wednesday during the party in Wilkinsburg. Two men are in critical condition and a woman is stable.

Allegheny County police say the cookout was taking place at the rear of a home on Franklin Avenue when the gunmen appeared just before 11 p.m.

Lt. Andrew Schurman of the Allegheny County homicide unit says they opened fire in an ambush-style attack. He says gunshots came from two distinct locations, but police don't believe anyone at the party fired back.

Four of the victims died on the back porch. The other died at a hospital.

A motive isn't immediately known.