A suspected carjacker pushed a first responder out of his stolen ambulance early Monday. GPS was credited with helping to track down one of the suspects. The 32-year-old ambulance driver was doing some work in the back of his running ambulance parked at 12th and Loudon streets in the Logan section of Philadelphia just before 3 a.m. when the worker felt the ambulance suddenly moving, he told Philadelphia Police. “When he realized the ambulance was moving he went into the driver compartment and saw two people he didn’t know who were actually stealing the ambulance,” Philadelphia Police Chief Inspector Scott Small said.