JOLO: At least 14 people were killed and 75 wounded - including members of the security forces and civilians - in twin bombings Monday involving a suicide attacker on a southern Philippine island that is a stronghold of Islamist militants, officials said.

The apparently coordinated attacks happened in Jolo in Muslim-majority Sulu, where government-backed security forces have long been fighting the Abu Sayyaf group. Seven soldiers, a police officer, and six civilians were killed in the two bombings, the first at around midday when an improvised explosive device attached to a motorcycle parked outside a supermarket blew up, Lieutenant General Corleto Vinluan said.

That was followed by a second blast a short time later in the same street when a suicide attacker blew herself up as security forces cordoned off the area, Vinluan said. A soldier had been trying to apprehend the bomber when she detonated her explosives, he added.

A total of 48 civilians were also wounded along with 21 soldiers and six police. A soldier saw a person leave the motorbike outside the grocery store "where there were a lot of people" including members of the military. It immediately detonated, Lieutenant Colonel Ronaldo Mateo said. "Our soldiers are conducting security operations. That was the time that the improvised explosive device detonated," he said. Abu Sayyaf was "most probably" behind the double bombing, Mateo said.