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NEW DELHI : India declared a high security alert at several of its airports on Thursday following the discovery of an anonymous letter threatening car bomb attacks by the Al-Qaeda terror network, officials told AFP.

A senior Home Ministry official said a security advisory had been sent to 20 domestic and international airports, after the threatening letter was discovered in a rubbish bin in a southern Indian airport.

A spokesman for the Central Industrial Security Force, which guards civilian airports, said some six airports - mostly in the south of the country - had been placed in a state of "high alert".