An offshore earthquake of magnitude 6.9 has jolted a central Philippine province and collapsed the walls of houses and buildings, killing at least 31 people. The quake late Tuesday injured scores of people and sent residents fleeing homes into darkness as the intense shaking cut off power. The earthquake was just outside Bogo, a coastal city of about 90,000 people in Cebu province. The toll was expected to rise as rescuers tried to move heavy equipment into damaged areas to assist search efforts.