Officials are urging witnesses to come forward as they search for the shooters who fired into a Philadelphia crowd, leaving 3 dead and 11 wounded.
Mandatory Credit:	Michael Perez/AP

Officials are urging witnesses to come forward as they search for the shooters who fired into a Philadelphia crowd, leaving 3 dead and 11 wounded.
Mandatory Credit: Michael Perez/AP

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2 arrested after Philadelphia shooting left 3 people dead and 11 wounded, officials say

A night of revelry on Philadelphia's South Street turned chaotic Saturday as gunmen opened fire into a crowd, leaving two people and a suspect dead and 11 wounded in one of at least 13 weekend mass shootings across the United States.