Explosion at Japanese Nuclear Plan

White smoke rose again over a nuclear plant in northeastern Japan Monday after an explosion at a building housing a reactor there.
A buildup of hydrogen in the Fukushima Daiichi plant's No. 3 reactor building likely caused the blast, authorities said, which injured six people. But the explosion did not damage the reactor or result in significant radiation leakage, Chief Cabinet Secretary Yukio Edano told reporters.
The No. 3 reactor is one of two at the plant where workers have been injecting seawater in a last-ditch effort to cool down fuel rods and prevent a full meltdown after an 8.9-magnitude earthquake and the resulting tsunami Friday disabled cooling systems.
'There is no massive radioactive leakage,' Edano said after Monday's blast, according to a report of CNN.
The explosion blew away the roof and walls of the building housing the reactor, Japan's Kyodo News reported. A similar blast occurred Saturday at the plant's No. 1 reactor.