The assailants were riding on a motorcycle and fled soon after hurling the grenade, according to the local Police. A lead provided by the hospital management seemed to suggest that the attack might have been mounted by a disgruntled security guard who was sacked some weeks ago. The police are investigating his possible role in the attack. Built over a hundred years ago by Dr Theodore Pennell, the Mission Hospital is one of five church-run Hospitals located along the border with Afghanistan. This is the second Christian hospital to be targeted in the past eight weeks. Last August terrorists threw Several hand-grenades outside a chapel of the Taxila Christian Hospital. Five female nurses were killed in The attack.