The boy, who suffered a gunshot wound to the back, and the two teens were hospitalized in critical condition, authorities said.
The gathering, a birthday party for a man who recently died, occurred while a stay-at-home order was in effect to help stop the spread of coronavirus, WTXF reported.
"They should not have been gathering, but that is not the issue here," Melvin Singleton, Philadelphia's deputy police commissioner, said of the victims.
Authorities have not arrested any suspects in connection with the case. No further information was immediately available.
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