Gurdaspur, India: Indian security forces on Monday were battling an attack on a police station near the Pakistan border in which at least six people have been killed.

Authorities said three police officers and three civilians had been confirmed dead in the hours-long siege, which began early Monday in the town of Gurdaspur in the northern state of Punjab.

The attackers shot and killed Superintendent of Police Baljit Singh, reports IANS quoting police.

Singh suffered injuries in the gun battle between security forces and the militants holed up in the police station in this town near the border with Pakistan, said police officials.

Singh, who headed the detective branch of police in Gurdaspur, succumbed to his wounds in a hospital.

About ten more people have been injured in the attack and an AFP reporter at the scene said fierce firing could still be heard around the police station, bringing panicked residents out onto the streets.

Deputy police commissioner Abhinav Trikha said the attackers appeared to be holed up in the residential quarters of the police station and were ‘firing continuously’.

‘There were three to four attackers. They were dressed in army uniforms and came in a Maruti car,’ he told journalists at the scene.

Five live bombs were recovered from nearby railway tracks and television footage showed one officer walking away from the scene, his face and uniform covered in blood.

The attackers reportedly opened fire on a bus and hijacked a vehicle before storming the police station.

Home Minister Rajnath Singh said he had ordered increased security on the border with Pakistan, although it remained unclear who was responsible for the attack.

It is the first major attack in India’s Punjab for more than a decade and the state’s Chief Minister Prakash Singh Badal blamed a lack of security on the border.

‘This militancy is a national problem, not a state problem, so it needs to be tackled with a national policy,’ he told reporters.

‘If prior intelligence input had been given, they should have properly sealed the borders.’

 Such incidents are relatively common in the volatile Kashmir region, which is divided between India and Pakistan and claimed in full by both.

Neighbouring Punjab, a majority-Sikh state, has largely been spared the violence that has plagued Indian Kashmir.

Some media reports suggested the attackers may have crossed into Punjab from Kashmir before launching their assault.

Security in the national capital has been beefed up and a red alert has been sounded following the terror attack, police said.

‘The security in the national capital, which is always kept on high alert, is beefed up around Independence Day. However, following the attack in Punjab's Gurdaspur district, a red alert alert has been issued here,’ said police.

Special security arrangements have been made at all railway stations, bus stops, major markets and important government buildings and offices.