Intelligence agencies on Thursday warned 22 airports in four states, as well as Delhi, of a possible terror attack. The Civil Aviation Security Bureau has sent detailed notices to the airports, the police chiefs of each state, the Central Industrial Security Force that guards airports and to private and state-run airlines, according to NDTV.

Officials have confirmed that security has been increased, and the border states of Jammu and Kashmir, Punjab, Rajasthan and Gujarat are on high alert. While additional measures are taken during every festive season, agencies are particularly concerned about the possibility of an attack in the wake of heightened tension along the Line of Control with Pakistan following the Army's surgical strikes.

Early on Thursday, three militants were killed in Jammu and Kashmir's Kupwara district after their infiltration attempt. On Wednesday, National Security Adviser Ajit Doval had warned Prime Minister Narendra Modi at a meeting of the Cabinet Committee on Security that said around 100 militants were gearing up to cross the LoC and launch attacks in India.