Border Security Force (BSF) official said, "The Pakistani border guards opened fire on the Indian positions in Ramgarh sector in a bid to infiltrate terrorists, provoking the Indian side to retaliate."
"The firing from across (the border) seems to be a cover to facilitate infiltration (of militants)," a BSF official was quoted by news agency as saying.
The firing started around 7.30 pm in Ramgarh, on Monday, Dec 21, about 45 km southwest of here.
Intermittent exchange of fire is still on, the official added.
According to defence sources, Indian Army units along the international border have been alerted.
There was no immediate report of casualty on the Indian side, they said.