The Navi Mumbai police in Maharashtra have registered an FIR and started a probe in connection with calls received about a bomb on a Mumbai-Ahmedabad flight and a threat to blow up Chhatrapati Shivaji Maharaj International Airport (CSMIA) in the metropolis, an official said on Thursday, reported the PTI.

The threat calls were received between 2 pm and 2:30 pm on Wednesday at the office of the Navi Mumbai joint commissioner of police, a CBD police station official said.

The callers said that a bomb was placed on board a Mumbai-Ahmedabad flight and an another call mentioned that the Mumbai international airport would be blown, the official said on Thursday.