April 9: Two of the world's largest concrete pumps – one from Los Angeles, and one from Atlanta – left the US for Japan to help pump water onto the damaged reactors from a safe distance. Tepco's president also apologized to the Japanese public for the nuclear crisis. A spokesman also said the company hoped to stop pumping radioactive water into the ocean by Sunday.
Week 4 , April 4 - April 8
April 8: China's Foreign Ministry said it is concerned about and will monitor Japan's actions to regain control of Fukushima, saying Tokyo must provide swift and accurate information to its neighbor.
April 7: A massive 7.1 aftershock struck northern Japan's Miyagi Prefecture. Workers temporarily evacuated Fukushima as tsunami advisories were issued and then lifted. Two out of three external power lines to the Onagawa nuclear power plant, 75 miles northeast of Fukushima and near the epicenter of Thursday's temblor, have been damaged, causing power loss. South Korea criticized the Japanese government for failing to notify its neighbor that it would pump radioactive water into the sea.