Six gunmen are reported to have been shot dead by Indian security forces at New Delhi's main international airport.
The BBC last night attributed the claim to air officials.
Airports in India went on high alert yesterday following fresh warnings of attacks as officials said India suspects two senior leaders of a banned Pakistani militant group planned last week's deadly siege in Mumbai.
The alert comes as Pakistani President Asif Ali Zardari promised visiting US secretary of state Condoleezza Rice his country would take "strong action" against any elements involved in the siege.
The alert warning of possible airborne attacks focused on three main airports - New Delhi, Bangalore and Chennai - but security was stepped up across the country.
"This is a warning which we have received. We are prepared as usual," said India's air force chief, Fali Homi Major.
Heavily armed guards from India's Rapid Deployment Force manned roadblocks outside airports, while others patrolled inside airport buildings.
Meanwhile, officials continued to probe the attacks. Evidence points to two members of outlawed Pakistani group Lashkar-e-Taiba as their masterminds.
Zaki-ur-Rehman Lakhvi and Yusuf Muzammil are believed to be in Pakistan. Lakhvi was identified as the group's operations chief and Muzammil as its operations chief in India.
The lone surviving gunman in the assault, Ajmal Amir Kasab, 21, told police Lakhvi recruited him and the assailants called Muzammil on a satellite phone after hijacking an Indian vessel en route to Mumbai.
During the attacks, the gunmen used mobile phones taken from hotel guests to call the Pakistani city of Lahore.Kasab has told police he and the other nine attackers trained for months in Lashkar-run camps in Pakistan.
The growing evidence linking the attacks to Pakistani-based militants came as Secretary of State Condoleezza Rice met leaders in Islamabad after visiting India's capital.
"I have found a Pakistani government that is focused on the threat and understands its responsibilities to respond to terrorism and extremism," she said at a news conference with Zardari.
Indian security forces face criticism they missed warnings and bungled their response to last week's attacks by 10 suspected Muslim militants that killed 171 people in against hotels, a restaurant and other sites across Mumbai.
An unexploded hand grenade was found yesterday outside a hospital hit by attacks. On Wednesday, police detected two bombs left at Mumbai's main station.-AP
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