At least 16 persons were killed when a suicide bomber blew himself up in a mosque in Pakistan's Mohmand Agency during Friday prayers.As many as 23 others were injured in Ambar town, Dawn news online quoted Assistant Political Agent Naveed Akbar as saying. Those injured were admitted to hospitals in Bajaur Agency, Charsadda and Peshawar for treatment.A security source confirmed that the explosion was a suicide blast as the attacker blew himself up in the verandah of the mosque.No group has yet claimed responsibility for the attack.