Government has put all Air India planes operating in the country's neighbourhood on high security alert and directed the airlines to deploy sky marshals following intelligence inputs that Pakistan-based LET and other terror groups were planning to hijack a flight.

A directive has been issued to all Indian missions abroad to sensitise the staff of the airlines, official sources said. According to intelligence inputs, terrorist groups having allegiance with Al-Qaeda, Lashker-e-Taiba and Jamat-ul-Dawa were planning to hijack an Air India plane especially operating in or from SAARC countries -- Nepal, Bangladesh, Sri Lanka, Bhutan, Maldives, Afghanistan, Pakistan and India as well.

Hijacking could be attempted by the terrorists from airports located at Yangon, Dhaka and Colombo.