Two bombs have killed at least 20 people attending Sunday Mass at a cathedral in the southern Philippines. The first explosion took place inside the Cathedral of Our Lady of Mount Carmel on Jolo island at 08:45 local time. The second device was detonated in the car park as soldiers rushed to help victims of the first blast. Most of the victims are civilians. Defence Secretary Delfin Lorenzana deplored the attack and urged locals to work with the authorities to "deny terrorism any victory". No group has so far claimed responsibility, but Islamists are active on the island.