Police overcame a group of heavily armed men dressed in military fatigues on Monday after a 12-hour gun battle that ended in a small-town police station in Punjab near the border with Pakistan, and at least nine people were killed.
Police in Punjab killed three unidentified assailants who had pulled up at the police complex in a stolen car, automatic weapons blazing, at about 5 a.m. (2330 GMT Sunday).
Prime Minister Narendra Modi and his top ministers have not made detailed statements on the attack, which is certain to raise tensions with Pakistan if it is proven to have originated across the border.
The gunmen shot dead a barber and tried to hijack a bus before rushing the police station, witnesses said.
Shoe shop owner Amit Sharma, 43, was woken by the sound of gunfire at dawn.
"I thought someone was setting off firecrackers," Sharma told Reuters. Instead, he saw three men with assault rifles "spraying bullets everywhere."
Throughout the day, regular bouts of small arms fire echoed across the town of Dinanagar and the paddy fields surrounding it, some 15 km (10 miles) from the international border, Reuters witnesses said.
Three policemen and three civilians were killed, according to the home ministry.
The siege focused on an abandoned building where the attackers holed up. It dragged on because security forces had wanted to capture at least one of the militants alive, a senior government source said.
Police sources added that the attackers entered India from Pakistan two days ago a short distance to the north in the state of Jammu and Kashmir, where separatist guerrillas are seeking independence from India.
Jitendra Singh, a junior minister in Modi's office, said he did not rule out Pakistan's involvement.
"There have also been earlier reports of Pakistan infiltration and cross-border mischief in this area," said Singh, whose constituency in the Jammu region borders Gurdaspur.
Kashmiri separatist leader Syed Salahuddin, who is based in Pakistan, denied his men were involved in the attack.
"They are not Kashmiris ... According to my information definitely not... They could be home-grown militants," he told Reuters by telephone.
RARE ATTACK IN PUNJAB
Attacks on security installations by militants dressed as soldiers or police are common in Jammu, but Monday's was the first such assault in Punjab in 13 years, according to data from the South Asia Terrorism Portal, which tracks militant violence.
Nuclear-armed rivals India and Pakistan have fought three wars since both nations gained independence in 1947.
Pakistan has denied any involvement in insurgencies in Punjab and Jammu and Kashmir, and Islamabad's foreign office said it was not aware of any reports that the people involved in Monday's attack were Pakistani.
Home Minister Rajnath Singh said he had spoken to the head of India's Border Security Force and "instructed him to step up the vigil" on the border.
Five bombs were also found on a railway track in the state, in a possible sign of an attempted coordinated attack.
The group of attackers came in a white Maruti-Suzuki car they had stolen at gunpoint, a local politician told Reuters.
The car was abandoned next to the police station with its windshield peppered with bullet holes, and broken glass and bullet casings on the passenger seat.
