New Delhi: Passengers faced a tough time at the Delhi airport early on Monday as the server of the immigration system encountered technical glitches. Six flights were delayed by half an hour and two by over an hour as a consequence.

An Air India official told PTI that the immigration system server was down for over 40 minutes since 12.20 AM. At around 1 AM, the official also said crew for three Air India flights were stuck and that no timeline had been given by immigration authority to resolve the issue.

A public announcement was made at the airport about the server problem and that personnel had started doing manual checking process, according to a passenger who was to catch an Air India flight to San Francisco.

Many passengers took to Twitter to complain about the delay in the immigration process and some of them also tweeted pictures of long queues at the airport.

The incident comes a day after Air India’s Passenger Service System faced technical glitches and was not functional for more than five hours. The incident on Saturday early morning had also resulted in a delay of scores of Air India flights.

The Indira Gandhi International Airport (IGIA) is the busiest airport in the country.

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

Officials told a leading daily that the airside was also completely monitored while assuring that there was no need to panic. To avoid taking any risk, all vehicles entering air side were being scanned.