The Quick Reaction Teams (QRTs) and Anti Sabotage Teams (ASTs) have also been stationed at the airport and other important places, sources said.
Central Industrial Security Force (CISF), the paramilitary agency in charge of security in the airport premises, does its own patrolling inside. Armed with sniffer dogs and
bomb squads, nearly 2,200 personnel are on duty. From outside, the airport is under the charge of the Delhi Police.
For the security of prominent people and important installations in the city, the commandos of the Special Protection Group (SPG) are being assisted by the Delhi Police. Information is being shared by the minute.
The security unit of Delhi Police, consisting of some 8,000 officers including 250 well-trained commandos, has also been made part of these elaborate arrangements at vulnerable places. These commandos carry AK-47 rifles, MP 5 guns and a very small and sophisticated pocket pistol.