NEW DELHI: A Delhi policeman was killed and another injured after a Mercedes, allegedly been driven at high speed, ran them over at Paschim Vihar in New Delhi at around 2 am.The two constables, Deepak Singh Chauhan (41) and Amit Kumar (24) were on night patrolling on a motorcycle when they were knocked from behind. Chauhan, father of two, succumbed to injuries by the time help arrived.Kumar suffered injuries in his leg. He is reported to be critical.The accused, reportedly a businessman named Gurdeep Singh and a resident of Greater Kailash-1, had fled from the accident site, but was arrested later.During interrogation, Gurdeep, has reportedly said he fell assleep while he was driving and didn't notice the cops in front of him.Meanwhile, a case of rash driving has been registered against Gurdeep