After a hijack warning that a civilian airport could be targeted by terrorists in 48 hours, officials said the Central Industrial Security Force (CISF) on Thursday increased security around the Delhi airport runway and tarmac.

Officially said to normal people there was no need for panic and assured that they had increased command deployment around the tarmac and stationed spotters and snipers on watchtowers. From the terminal and the city access gates to the air-side were strictly monitored, a senior CISF official said.

The threat was received from a northeastern state that put civilian airports on high alert, which were listed as hyper-sensitive airports. We've stepped up the route and taxiways deployment. Our rapid reaction teams have increased patrolling frequency. Our men patrol the boundary of the airport so that intrusions can be stopped, an officer said he was not allowed to speak to the media. 

The officer also said they were on the drone alert. The CISF scans vehicles that enter the airside, especially trucks for catering. "Our dog squad is a sweeping area where luggage is stored before loading onto the aircraft. The employees of firms responsible for ground duty and those who have access to the airside are being kept strictly watched, "the officer said. 

As the airside can also be accessed from there, the CISF also increased security at cargo terminals. This is the second alert in a week that sounded like that. On Saturday, airports across India were placed on high alert days after the Pulwama attack. Security agencies had asked staff to check all vehicles entering parking areas, with the exception of improving safety at other critical points. 

The earlier warning was sounded after receiving a threat call in the control room of Air India in Mumbai. Some sector airlines, including those traveling to Gulf and Pakistan, were asked to carry out secondary ladder point checks where passengers are checked again just before boarding the aircraft.