Flight operations at the Srinagar International Airport had to be halted for thirty minutes on Friday after a bomb threat as the authorities took preventive measures, officials said.          The Air Traffic Control (ATC) at the Srinagar Airport received a bomb threat on an Air Vistara flight from New Delhi, prompting a response from the authorities, including the Central Industrial Security Force (CISF), which is responsible for the security at the airport, the officials said