Barmer/Jaisalmer, Jan. 11 -- A station house officer (SHO) and three constables were injured after a head on-collission between their police car and a sleeper bus on National Highway-11 in Pokaran area of Jaisalmer district on Saturday morning amid dense fog, police said. According to police, the accident took place around 8.30am when visibility on the highway was almost zero due to heavy fog, adding the collision was so severe that the police vehicle overturned. The injured include Mohangarh SHO Baburam and three constables who were trapped inside the car. All four were later referred to MDM Hospital in Jodhpur for advanced treatment....