While the airline officials declined to speak on the issue, sources in the national carrier said that a two-tier security mechanism has been put in place which carries out extensive check of all the baggages loaded into the aircraft.At present, the screening of baggages is done by a local Afghan agency and now Air India has included another tier of security where its staff carries out screening of the luggage of all the passengers, the sources said. Intelligence agencies warned Indian authorities that terror groups were planning either to hijack its aircraft or smuggle some explosives in the luggage.A report emanating from the war-ravaged country shows terror groups were attempting to penetrate into the ground handling agency of Air India.