Netaji Subhash Chandra Bose International Airport in Kolkata, India, has improved its security after receiving three calls about a bomb being planted in the airport.
The first two calls were received by Lalbazar Police Control Room at around 1.15am, while the third was received by Bidhannagar Police Commissionerate in Kolkata.
The first call stated that a person named Arshad was carrying a bomb to blow up the airport, police officials told Press Trust of India.
Following the calls, a bomb squad, sniffer dogs and a Central Industrial Security Force (CISF) team went into action, but found nothing.
The Central Industrial Security Force is conducting thorough checks at the airport's cargo and passenger terminals.
Earlier in March, the airport received an email, later traced to Germany, threatening that it would be blown up within 24 hours.

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By GlobalDataThe international airport at Kolkata, which serves a hub to the north-eastern parts of India and eastern Asia, had increased its security after the attack on Dhaka Bakery in July.