Refusing to comment on the intruder build-up at Kamri, a spokesperson of the 28 Infantry Division admitted that the ``Army had gone on an artillery offensive in the Gurrez sector.''

Intelligence reports point to three major concentrations of infiltrators across the 200-km LoC stretch of ``unheld'' territory from Gurrez in the West to Turtuk in the North-East. At Kamri, which fronts the Gurrez-Davar sector, estimates vary from 300-1,300 Taliban Afghans, Pakistanis and Bosnian Muslims. At Skardu, fronting the besieged Kargil LoC sector, reliable estimates point to 2,000intruders.

In the Chorbatla-Turtuk sector of Leh, where intruders have managed a limited level of incursion and a heavy exchange of artillery fire is continuing, 200 heavily-armed fighters, mercenaries and Pakistani Army regulars are reportedly poised on the LoC.

So far, only the Gurrez-Tulail Valley sector (adjoining the Mushko Valley where nearly 100 intruders are holing out) has been free of incursion. Incursion in late winter was offset by the year-round maintenance of BSF posts at 14,000-16,000 feet in the Tulail Valley. Vigilance and intensive patrolling by troops of the 28 Infantry Division in the Gurrez sector similarly kept the area clean through the winter.

However, following reports of an intruder build-up at Kamri a week back, Indian artillery pounded the Pakistani Brigade HQs and routes to the LoC so as to prevent any movement forward. At the same time, the BSF and the Army pushed troops in, including a full reserve Brigade to add to the Brigade at Davar, to posts right up front at ``warlocations''. Helicopters and ground patrols are conducting round-the-clock surveillance in the area.

Indian Army convoys moving up reinforcements and artillery from Bandipore to Gurrez have are under heavy Pakistani artillery and mortar fire. ``Indian artillery is giving back a double dose to the Pakistanis to keep their heads down and inflict casualties. Indian convoys are moving up to Gurrez under this covering fire,'' a senior officer said.

Pakistani firing in Anzimarg, Chirwan, Bagtoor and Davar have triggered migrations, damaged a school building and killed an Army porter.