Security at the Chhatrapati Shivaji Maharaj International Airport here was tightened following a threat to hijack an Air India aircraft, officials said on Saturday.

A call, early this morning to the AI Operation Control Centre at the Mumbai airport, threatened to hijack an aircraft and take it to Pakistan, after which the authorities got cracking.

Central Industrial Security Force's Additional Inspector General of Police Hemendra Singh told IANS that the paramilitary force, which guards airports around the country among other vital installations, had already been on high alert in wake of the Pulwama attack and after this alert, it had further increased its vigil.

--IANS

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