Udhampur-based Northern Command headquarters has been kept in a State of high alert following recent terror strike on a BSF convoy along the Jammu-Srinagar National Highway near Narsoo Nallah, 17 kms away from the district headquarters. Two BSF jawans were killed and 13 others injured in the attack by Pakistan-based militants, reportedly belonging to lashkar-e-Tayyeba militant outfit on August 5.