Panic gripped passengers at the Indira Gandhi International Airport (IGI) in Delhi on Tuesday after the Jet Airways call centre received threats about bombs in five of its aircraft.
The calls came within hours after blasts ripped through Brussels airport killing several people.
Two Jet Airways crew members were injured in the blasts at Brussels airport on Tuesday.
While three of the planes had already departed by the time the anonymous call about the bomb threats was received, the fourth aircraft, which was bound for Chennai, was diverted to Nagpur, sources said.
Another plane, also bound for Chennai which was preparing for take off, was grounded and is undergoing checks by the security agencies, a senior police official said.
“Jet Airways has received a security alert for five flights from Delhi. All flights are on ground and are being checked by security agencies at the respective airports,” the airline said in a tweet but did not share specific details.
“We regret the inconvenience caused to our guests. The safety and security of our guests and crew is always our main priority,” Jet Airways said.
Jet Airways Statement: pic.twitter.com/Qrx5DGYdwH— Jet Airways (@jetairways) March 22, 2016
Sources said the three planes, which received bomb threats, had already flown to their respective destinations -- Gorakhpur, Chandigarh and Dehradun.
A string of explosions ripped through Brussels airport and a city metro station, killing at least 34 people in apparently co-ordinated strikes that came days after the prime suspect in the November Paris attacks was arrested in the city.