ISLAMABAD, Aug 11: Pakistani investigators said on Sunday that the three men behind Friday’s grenade attack on a hospital chapel were believed to belong one of two banned Islamic militant groups.

One of the three died in the attack, in which grenades were lobbed into a crowd of women filing out of a Presbyterian chapel, killing three nurses and injuring dozens more.

“After identifying the accused who was killed in the attack, we have information that the attackers were members either of the banned Jaish-i-Mohammad or Harkat-ul-Mujahideen groups,” Rawalpindi District Mayor Tariq Kiani told Reuters.

“Or they may be members of splinter or breakaway groups of these banned outfits,” he said. “We believe we will track down the remaining two...we are pretty sure we will arrest them.”

On Monday, three men raided a Protestant missionary school for foreign students in Murree killing six Pakistanis. The three later blew themselves up after being challenged by police.

Investigators said an autopsy on the attacker who died on Friday showed he was hit by a piece of shrapnel from a grenade.

Kiani identified the killed attacker as Kamran Butt, a resident of Rawalpindi. “The police are questioning his friends and relatives to find more details so as to reach the remaining two attackers.” An officer said Butt had fought alongside mujahideen in occupied Kashmir.—Reuters