CHENNAI: About 200 CISF commandos have descended on the Chennai airport which now resembles a fortress. But on closer scrutiny, chinks in the security armour are obvious.

A multi-layer security ring has been thrown around the airport, from the runway to the periphery of the airport premises, and barricades put up to slow down vehicles.

But there are no metal detectors or mirror undercheckers to detect vehicles fitted with explosives.