Aviation spokeswoman Moushumi Chakravarty said that the airports were placed on alert Thursday after the government received warnings from the intelligence agencies.
A report in The Indian Express newspaper, which Chakravarty confirmed, said intelligence officials had uncovered a plot by militants linked to al-Qaida and the Pakistan-based Lashkar-e-Taiba group to hijack an Air India or Indian Airlines flight destined for a neighboring South Asian country.
U.K. Bansal, a top home ministry official, said security was tightened at all airports and passengers were being subjected to more intense security screenings. The India Express reported that sky marshals would also be deployed on flights around the region.
