Japan quake stirs nuclear fears Officials at the world's biggest nuclear power plant said on Tuesday there had been more minor radiation leaks after an earthquake in Japan that killed nine people and forced thousands from their homes. Strong quake rocks Japan, nuclear plant A strong earthquake struck northwestern Japan on Monday, causing a fire and minor radioactive water leak at one of the world's most powerful nuclear power plants and turning buildings into piles of lumber. At least seven people were killed and hundreds injured.