SAPPORO, Japan (AP) - Japan's prime minister says at least nine people are dead after a powerful earthquake on the country's northernmost main island of Hokkaido. The quake triggered dozens of landslides that crushed houses under torrents of dirt, rocks and timber. Rescuers began frantic efforts to unearth survivors. Officials say more than 350 people were injured, and about 30 were unaccounted for after the magnitude 6.7 quake. Nearly 3 million households were left without power by the quake. It's the latest in an exhausting run of natural disasters for Japan. In the town of Atsuma, where entire hillsides collapsed, rescuers used small backhoes and shovels to search for survivors under the tons of earth.