New Delhi: As Bureau of Civil Aviation Security issued an alert for all airports and airlines in the country, visitors entry at Lucknow’s Chaudhary Charan Singh International (CCSI) airport was stopped with immediate effect on Saturday In view of prevailing threat perception, extra security measures were also enforced.

Earlier in the day, the Bureau of Civil Aviation Security (BCAS) had issued security guidelines for airports, airlines and other aviation companies in the wake of the heightened tension between India and Pakistan. Some of these measures included strict access control to the terminal, apron areas; enhanced screening of passengers, bags, cargo; intensive check on vehicles entering airports, terminal buildings etc.

“In view of the intelligence input in the aftermath of the Pulwama attack and subsequent developments, it is imperative to enhance the existing security measures being taken at all the civil aviation installations like airports, airstrips, airfields, air force stations, helipads, flying schools, aviation training institutes etc. so that no untoward incident takes place,” the alert notification read.

Following the advisory, security was beefed up at the Delhi airport also following a hijack alert that a civilian airport could be targeted in the next 48 hours. Commandos were deployed around the tarmac while spotters and snipers were put on watchtowers.

Meanwhile, in Mumbai, authorities at the Chhatrapati Shivaji International Airport had said that they received a “non-specific” bomb threat call at around 11 AM on Saturday. Security teams had also started a cordon and search operation inside the premises following the threat call.