02/08/2011 05:50 BST | Updated 01/10/2011 06:12 BST

Radiation Reaches Lethal Levels At Japan's Fukushima Nuclear Plant

Pockets of lethal levels of radiation have been detected at Japan's crippled Fukushima Daiichi nuclear plant in a fresh reminder of the risks faced by workers battling to contain the worst nuclear accident since Chernobyl.