New Delhi: A 45-year-old man was killed and his teenaged son injured on Tuesday morning when they were fired upon by unidentified persons in a Swift car in east Delhi. Three passersby were also injured in the incident, police said. Deputy Commissioner of Police Ajit Kumar told IANS: "Kailash Gupta was shot dead by a few unidentified men in Bhajanpura area." The incident occurred at around 8.15 a.m. near a 'mazaar' in east Delhi's Bhajanpura area. Kailash, a resident of Harsh Vihar, was on a motor cycle with his son Rajan, 16, when the incident occurred, police said. "His son received bullet injuries in the firing," the DCP said, adding: "Two other passersby were injured in the firing incident, while another person was hit by the assailants' car." All the injured were taken to hospital. They have been identified as Banwari Lal, Ram Lakhan and Javed, police said. "A case of murder has been registered. We are probing the matter from all angles," the DCP said. The police is also looking at CCTV footage of the area to identify the assailants' car. A senior police officer, requesting anonymity, told IANS: "Prima facie, it seems to be a case of personal enmity."