A joint team comprising personnel from CISF, Delhi Police, bomb disposal squad, fire service and intelligence agencies was rushed to the spot immediately.

According to the official, the Swiss Airways flight was to take off for Zurich while the Jet Airways and the Cathay Pacific Airways flights were scheduled to fly to Hong Kong.

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"All the flights carrying around 500 passengers were scheduled to fly from Delhi around 2 a.m. on Saturday. Just after getting the information of bomb, these flights were properly checked for over 3-4 hours," said a CISF official.

All the three flights were given the green signal between 7 a.m. and 8.30 a.m., one after another, he said.

Police said they have traced the number but the caller is yet to be nabbed.