"Snow drifts reaching up to rooftops kept tens of thousands of villagers prisoners in their own homes Saturday as the death toll from Europe's big freeze rose past 550.

More heavy snow fell on the Balkans and in Italy, while the Danube river, already closed to shipping for hundreds of kilometres (miles) because of thick ice, froze over in Bulgaria for the first time in 27 years.

"Concern is growing that the Fukushima Daiichi nuclear power plant in Japan is no longer stable after temperature readings suggested one of its damaged reactors was reheating."

"The California Department of Fish and Game intends to sue the U.S. Army Corps of Engineers over its policy banning trees on levees."

"Pacific Gas and Electric Co.'s old gas lines are riddled with potentially lethal weld flaws, and new welding that the company's crews did during pipeline testing last year is suspect, two veteran welders told state regulators this week."

"NEW ORLEANS -- A scientific report issued by Gov. Bobby Jindal's administration predicts that the Louisiana coast could see about 3 feet of sea level rise along the already low and vulnerable Louisiana coast by 2100 -- a prediction that leaves this Cajun coast drowning and under siege from storm surge for decades to come."

"In the confusion following the earthquake and tsunami that damaged Japan's Fukushima nuclear complex last March, the Nuclear Regulatory Commission said it was standing by to help. But a trove of e-mails posted on the NRC's Web site shows an agency struggling to figure out how to respond and how to deal with the American public while cutting through what one official called "the fog of information" coming out of Japan."

"NAIROBI, Kenya -- The United Nations said Friday that Somalia's famine is over, but the world body's Food and Agricultural Organization warned that continued assistance is needed to stop the region from slipping back."

"EAST ST. LOUIS, Ill. -- When the Army Corps of Engineers declared last year that the levees here were 'unacceptable,' it kicked up a storm of protest from officials and residents of the broad Mississippi River flood plain known as the American Bottom."