A police official says security forces have swarmed through New Delhi's international airport after the sound of gunfire was heard, but no one was injured.

Police spokeswoman Rajan Bhagat says a handful of shots were apparently fired but no one was seen shooting.

He says: "It was not a terrorist incident. No one was killed ... There was no attack on the airport."

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Earlier reports from The British Broadcasting Corp. have said six gunmen were shot and killed by security forces at the airport.

A later BBC report says police have denied that anyone was injured, adding police were investigating "two sharp sounds" that had been heard.