Operation Jai Mata Di

In a midnight operation by armed men, thousands of pilgrims are taken hostage at Vaishno Devi, a popular Himalayan destination in one of the most volatile regions in the world - Kashmir. This is the largest ever hostage incident in the world, and the world's taking notice. The terrain is precarious for any armed operation by the Indian commandos. The hostage-takers have started acting on their threat - executing the pilgrims one by one. No terrorist group has claimed responsibility for the attack. Who are these men? Is there a larger plot?