CHAKWAL - Four passengers were killed and 12 others received multiple injuries when a Sargodha-bound wagon collided with a trailer at Salt Range area on Lahore Islamabad Motorway on Tuesday. The ill-fated wagon left from Chakwal and when entered the Salt Range area, its brakes were failed and collided with a Cement loaded trailer. Four passengers Khizar Hayat, Ch. Ahmed Saeed, Ghulam Fatima and Maqsood Bibi were killed on the spot while 12 sustained injuries in the accident. The six passengers in critical condition were shifted to Rawalpindi hospital.