In Japan, a powerful 7.4 magnitude earthquake off the coast of Fukushima killed four people and injured 100 others Wednesday. A tsunami alert has been lifted. The Tokyo Electric Power Company says the quake forced cooling systems at the Fukushima Daiichi and Daini nuclear power plants offline for several hours. The cooling systems are critical to preventing a nuclear disaster like the triple meltdown that followed Japan’s devastating 2011 earthquake and tsunami.