Indian security forces have battled into the evening to secure an air base near the border with Pakistan, a day after a militant attack that killed seven military personnel and wounded another 20.
As night fell on Sunday, it was unclear whether two or more militants were still at large after Saturday's pre-dawn raid on the Pathankot air base in northwestern Punjab state. Four attackers have been confirmed killed.
"The area cannot be declared fully sanitised," Air Marshal Anil Khosla told a news briefing in New Delhi.
Home Secretary Rajiv Mehrishi told reporters he hoped the two believed still to be at large would be "neutralised" overnight. Without recovering their bodies they could not be confirmed dead.
That contradicted earlier statements by home ministry and army officials who, speaking on condition of anonymity, said the two holdouts had been killed.
The attack by gunmen disguised as soldiers came a week after Prime Minister Narendra Modi made an unscheduled visit to Pakistani counterpart Nawaz Sharif in an effort to revive talks between the nuclear-armed neighbours.
Officials said the attack bore the hallmarks of previous suspected assaults by Pakistan-based militant groups, underscoring the fragility of recent efforts to revive bilateral talks between the often uneasy neighbours.
There was no immediate claim of responsibility.
Pakistan has condemned the attack and said it wanted to continue to build on the goodwill created by the impromptu meeting between Modi and Sharif last month.
Gunfire continued into the evening as security forces hunted the remaining attackers in the base, a sprawling compound just 25km from the border with Pakistan.
In a TV briefing from Pathankot, Air Commodore J.S. Dhamoon said the attackers had burst into a guards' mess at the air base, where they were preparing breakfast on Saturday morning.
A guard chased after one of the attackers and killed him in the struggle, only to be shot dead by a gunman's bullet. The other three attackers were neutralised in the late afternoon, said Dhamoon.
Indian leaders had already praised the armed forces for their heroism in Saturday's shootout, with Modi saying they did not let the "enemies of humanity" who attacked the base succeed.
But that appeared premature on Sunday, as shooting broke out after midday, sparking a renewed manhunt on the base, from which Indian Air Force MiG-21 fighter jets and attack helicopters fly.
Military trucks were seen entering and exiting the walled compound throughout the day, including a demining vehicle. Dozens of security guards continued their vigil, while protesters shouted slogans and burned a Pakistani flag nearby.
One of the Indian security men killed in the attack was Subedar Fateh Singh, who won gold and silver medals in the first Commonwealth Shooting Championships held in 1995, the National Rifle Association of India said.
