New Delhi, April 17 -- A 44-year-old man opened fire at a flyover near Nand Nagri in northeast Delhi on Tuesday morning, killing a policeman and injuring a passerby, and then attempted to flee the spot in an autorickshaw, before he died by suicide while seated in the three-wheeler, police officers said, adding that prima facie, the incident was triggered by a financial dispute between the suspect and the policeman....