However, no alert has been sounded yet, sources said.
A triple suicide bombing and gun attack by suspected ISIS terrorists at the airport in Turkey has left 41 dead and 239 injured.
Security agencies had in March tightened security at sensitive airports in the country, with passengers made to take off their footwear and belts and go through detailed frisking, after the Brussels terror attack.
At major airports in Delhi, Mumbai, Bengaluru, Hyderabad, Kolkata, Chennai and Ahmedabad, CISF and local police had shored up security apparatus and passengers were observed and screened minutely with risk-based Secondary Ladder Point Check which entails frisking people before they enter the aircraft.
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