Security was significantly heightened at the airport, railway stations, bus stands and other vital installations in the city.
Vigil was also heightened in several areas, including popular market places, in South Delhi, Central Delhi and the VIP movement zone in Lutyen's Delhi, a senior police official said.
Special Police Commissioner (Law and Order) is taking stock of the situation. Sleuths of Crime Branch and special cell of Delhi Police have also been roped in and the security unit has been asked to form a strategy in connection with potential threats to VIPs in the national capital, the official said.
Local police have been asked to remain extra vigilant and SWAT team and quick response team have also been deployed in several parts of the city for quick response in cases an emergency situation arises, the senior official added.
Suspected Pakistani terrorists attacked an Air Force Base in Pathankot in the wee hours, triggering an encounter in which four attackers and two IAF personnel were killed and six security men injured.

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