The victims were all male - three aged from 20 to 59 and the fourth believed to be between 16 and 21. Two boys, aged two and 13, were in a stable condition on Monday.
It is unknown whether this person was connected with the gunman, but police believe he returned fire."At this point all we know is that this person decided to leave their home and target individuals," Ms Outlaw said, talking about the main suspect.
Police were attending to victims when they heard more gunfire, the commissioner said, and dozens of shell casings were found.A Philadelphia police officer stands guard after multiple people were shot Pic: AP "We're canvassing the area to get as much as we can, to identify witnesses, to identify where cameras are located and to do everything to figure out the why."
The shooting is the 29th mass killing in the US in 2023, according to a database maintained by The Associated Press and USA Today in partnership with Northeastern University. There have been more than 550 mass killing incidents since 2006 in which around 2,900 people have died and at least 2,000 have been injured.
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