Airline sources said the caller, who identified himself only as Smith from the US, said at least 11 flights of IndiGo, which were either ready for take off or had already departed from around 10 airports, were facing bomb threat from a woman flyer.
The threat was for flights emanating from major airports like Delhi, Mumbai, Kolkata, Ahmedabad, Chennai, Srinagar, Vadodara, Guwahati, Goa and Kochi, sources said.
In a statement, IndiGo said its call centre at Chennai received a bomb threat call at 1113 hours and within minutes the security agencies were informed.
IndiGo said, "All our passengers are safe".
According to sources, security agencies were carrying out extensive search on these planes across nine airports.
The 11 fligts are Vadodara-Delhi (6E 591), Kochi-Delhi (516), Delhi-Srinagar (853), Delhi-Chennai (443), Ahmedabad-Kolkata (135), Delhi-Mumbai (223), Chennai-Mumbai (612), Delhi-Goa (329), Guwahati-Delhi (571), Delhi-Ahmedabad (161) and Delhi-Vadodara (734).
"We are actively engaged in working very closely with the concerned agencies. We can assure you that our operations are safe...," IndiGo said.
According to the airline, there are certain laid down procedures to be followed by the airlines, airports and other government authorities and "all such procedures were followed and are being followed".
Yesterday, a call was received about bomb threat to five Jet Airways flights from Delhi, barely hours after the explosions at Brussels airport, but it turned out to be a hoax.
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