Police said one gunman opened fire on the party, while a second took aim at victims as they attempted to flee.
“It looks like, right now, they were all fleeing toward the back door of the residence when the second gunman fired from the side of the yard, and they all seemed to get caught on the back porch,” Allegheny Country police Lt. Andrew Schurman told reporters.
The gunmen are still on the loose.
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