An IndiGo flight from Nagpur to Kolkata on Thursday made an emergency landing in Raipur after receiving a bomb threat which turned out to be a hoax, officials told news agency PTI. Hoqwever, a passenger was detained following the incident. The flight with 187 passengers and six crew members onboard landed at the Swami Vivekananda Airport here sometime after 9 am following the threat, Raipur Senior Superintendent of Police Santosh Singh said.