A Philadelphia teenager carjacked three victims in Bala Cynwyd using a handgun on three different occasions, Lower Merion police said.
The robberies took place in Bala Cynwyd on Sept. 15, Sept. 24, and Oct. 13.
The carjacker, weapon in hand, demanded the car keys, cash, and the victim's cell phone, police reported.
Lower Merion Police Investigations Unit investigated the reports and were able to identify the carjacker as a 17 year-old from Philadelphia.
Police arrested the 17 year-old after getting an arrest warrant.
The Philadelphia man is currently in custody and is being charged as an adult in Montgomery County with armed robbery and related offenses. He has not been identified.