The alert comes in the wake of a terrorist attack on India's financial hub Mumbai last week that left
more than 170 people dead.
Passengers have been asked to arrive three hours before their flights. There is more detailed checking.
All luggage is being 100% checked.
Three major Indian airports have been put on high terrorism alert .
All vehicles entering the airport premises were being checked and there was more "perimeter surveillance".
Chiefs of the Indian army, navy and air force held a meeting with federal Defence Minister in New Delhi late
to review security issues.
India has seen an increased surge of terrorist attacks in 2008 with serial bombings in several major
cities including the Rajasthan capital Jaipur, Ahmedabad in Gujarat and Guwahati in the north-eastern
state of Assam.
More than 400 people have been killed in these attacks.
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