An Indian commando on guard at the Bengaluru Airport in BangaloreFrom SKY News:
India has put all of its major airports on high alert after receiving threats that planes may be hijacked and used for possible attacks.
Airport security has been tightened and travellers are being asked to check in three hours before their flights.
India's air force chief Fali Homi Major said: "This is based on a warning, which has been received and we are prepared as usual."
Major airports - including New Delhi, Bangalore, Mumbai and Kolkata - have been affected.
Indian TV reported that the alert was issued after an email from Deccan Mujahideen, the same group that claimed the Mumbai attacks.
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