A strong earthquake rocked the Tokyo area Saturday afternoon, injuring at least seven people and causing minor damage to some buildings. The quake, which had a magnitude of 5.5 on the Richter scale, was centered just east of Tokyo. Though damage appeared to be light, Japan's Kyodo news service reported a temple wall collapsed, injuring seven people. According to the meteorological agency, the epicentre of the quake was in the province of Chiba, which lies on Tokyo's eastern border, at a depth of about 50 miles. The shaking lasted about 30 seconds in Tokyo. There were no immediate reports of injuries or damage, and Tokyo's subways and commuter train lines were not immediately affected.