India tightened security on the border with Pakistan on Monday after heavily armed men stormed a police station in the northern frontier state of Punjab, killing at least seven people and wounding several others.

Armed police exchanged fire with the gunmen, who were holed up in the police station in Gurdaspur district more than eight hours after the assault began at about 5 am, officials said.

Gunshots were heard on television as security forces in red turbans surrounded the building in the town of Dinanagar, about 15 kilometers from the international border. Soldiers were also deployed, at least one armed with a shoulder-mounted rocket launcher.