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.
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Meanwhile, an alert has been issued and security beefed up in Uttarakhand's capital city Dehradun and other cities including Haridwar and Rishikesh in the wake of the terror attack on Pathankot air force base.
Police said strict vigil is being maintained at Indian Military Acadamy Dehradun, Forest Research Institute Dehradun and other important places.
Strict measures have been taken to ensure security of devotees arriving at Haridwar and Rishikesh to attend the Ardh Kumbh Mela that begins tomorrow.
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Following today's terror attack at Pathankot Air Force station, security at Hindon Air Force station has been stepped up and a high alert has been sounded, said senior Superintendent of Police Dharmendra Singh.
He further said that all senior police officers from various police stations were immediately summoned and a combingoperation was conducted in all residential colonies and villages situated adjacent to Air Force Station's boundary wall.
Briefing about the protocol, SP (city) Sharma elaborated that a hotline will be established between Hindon Air Base and modern PCR to ease communications in case of any emergency.
Security deployment charts have been updated in the area, Sharma said adding, Air Force police is responsible for the security within the Hindon Air Force Station (inner cordon) and security outside the Air Base (outer cordon) will be monitored by civil police.
