PATNA, July 6 -- Prominent Bihar-based businessman Gopal Khemka was shot dead by a bike-borne unidentified assailant outside his residence in Patna, police said on Saturday, with the incident coming around seven years after miscreants had gunned down his son in Hajipur. The incident took place near the gate of Khemka's house in the posh Gandhi Maidan locality around 11.40 pm on Friday, when he drove back home from the Bankipur Club, around 1.4km away, and was waiting in his car for the guard to open the main gate, police said. An assailant wearing a helmet walked up to the businessman's car and shot him from a point-blank range, before fleeing in a scooty, police said. Chief minister Nitish Kumar convened a meeting on Saturday to review the...