A spokesman for Pakistan's military said he had no immediate information on the incident.

Prem Singh, a spokesman for India's Border Security Force, said Pakistani forces opened fire to provide cover for Islamic militants trying to cross into India's part of divided Kashmir, where the insurgents are battling New Delhi's rule.

He said it was the first violation of the 2003 ceasefire along the frontier dividing New Delhi's and Islamabad's portions of Kashmir, a Himalayan region split between India and Pakistan and claimed by both.

"It was an infiltration attempt that was thwarted," Singh said. "Two of our men, including an officer, were wounded. The officer is critical."

Pakistan angrily rejected Wednesday an allegation that its border troops fired at Indian forces in the disputed Kashmir region, allegedly to provide cover for infiltrating militants.

"The allegation is totally baseless, false and ludicrous," Pakistan army spokesman Major General Shaukat Sultan said.

India, an overwhelmingly Hindu country, has long accused Muslim Pakistan of supporting the more than a dozen Islamic militant groups fighting to wrest predominantly Muslim Kashmir from New Delhi. Pakistan insists it provides the militants only diplomatic and moral support.