DIAL control room's call centre in Gurgaon received the call around 7 PM, following which security agencies were informed and security was ramped up, said a police official.
"This was not a hoax call. Such calls are technically called non-specific calls and this particular one originated from an international number. It is also suspected to be executed through the Internet," DCP (IGI Airport) D K Gupta said.
"The caller, whom we are trying to trace for details, called up and said that a man who is heading for Germany from IGI will do something big in Delhi before he leaves. He did not disclose any further details," Gupta added.
The national capital is on a high alert till January 26 and security has been already stepped up following the terror attack at Pathankot and then inputs received by the police about the presence of suspected Jaish-e-Mohammad key members here.
Security has also been beefed up at railway stations, bus terminuses, markets and around vital installations in the city.
