CNN —Four people were killed and two minors – ages 2 and 13 – were injured in a shooting Monday evening in southwestern Philadelphia, police said. A second person – who may have picked up someone’s gun and returned fire – also was in custody, Outlaw said. About 50 spent shell casings litter the shooting scenes, Outlaw said. At least 339 mass shootings have happened in the US so far this year, according to the Gun Violence Archive. The archive, like CNN, defines a mass shooting as one in which four or more people are shot, not including the shooter.

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Persons: –, Danielle M, Outlaw, don’t Organizations: CNN, Philadelphia Police Locations: Philadelphia