RS717, PEW717, PE728, A728 were dispatched for a PIC with entrapment. Arriving units arrived on scene on the 7500 block of Airpark Rd. to find 4 cars involved with one patient ejected from vehicle. There were 2 patients who succumbed to their injuries on scene. The 2 other patients were checked for minor injuries at the scene. The cause of the accident is still under investigation by MCPD.