The injured people were 2 and 13 years old.
A suspect was apprehended with an AR-style rifle, a handgun, a bulletproof vest, multiple ammunition magazines in the vest, and a scanner after the shooting that spanned several blocks in or around the Kingsessing neighborhood, Philadelphia Police Commissioner Danielle M. Outlaw was quoted as saying by CNN.
A second person – who may have picked up someone’s gun and returned fire – also was in custody, Outlaw said.
He said the condition of the injured people was stable.
The cause of the shooting is still not known.