Jammu/New Delhi: Pakistani troops have slit the throat of a BSF jawan along the international border (IB) near Jammu, an incident that may further escalate the tension between the two countries.

The brutal and "unprecedented" incident that took place in the Ramgarh sector on Tuesday has prompted the security forces to issue a "high alert" across the entire IB and the Line of Control (LoC) even as the Border Security Force has lodged a strong complaint with its counterparts -- the Pakistan Rangers.

Official sources said the body of Head Constable Narender Kumar also bore three bullet wounds and it could only be retrieved from a spot ahead of the Indo-Pak fence after over six hours as the Pakistani side "did not respond" to the calls to maintain the sanctity of the frontier and ensure that the BSF search parties were not fired upon.

The Pakistan Rangers, the sources said, was asked to take part in a joint patrolling to trace the missing jawan, but they only came up to a point and cited waterlogging issues in the area that prevented them from undertaking a coordinated action.

The BSF then waited for the sun to set and launched a "risky operation" to bring the jawan's body back to the post.

Officials in the security establishment said the incident of brutality with the jawan, probably a first at the IB, was taken "very seriously" by the government and the Ministry of External Affairs and the Director General of Military Operations (DGMO) were also expected to take up the issue with their Pakistani counterparts.

They said since the BSF patrol party that went ahead of the fence to cut the tall "sarkanda" grass to clear the field was first fired upon at 10.40 am on Tuesday, hectic phone calls and communication exchanges went on throughout the day from the Indian side to across the border in order to locate the body of the jawan, who was first declared missing.