Army Maj. Nidal M. Hasan exchanged e-mails with a radical Yemeni American cleric and began to discuss surreptitious financial transfers, according to two sources.

The U.S. has spent $53 billion for relief and reconstruction in Iraq, but Iraqis' inability to maintain what's left behind could waste hundreds of millions of dollars and jeopardize basic services.

A gas explosion at a coal mine in northern China has killed 31 people and trapped 82, authorities say.

A civil rights organization says it has identified at least 50 new right-wing militia groups that have formed within the last two years, in part coinciding with the advent of the Obama administration.

Scientists circulated beams of protons in the world's largest atom smasher Friday night for the first time after a year of repairs caused by a spectacular failure after the $10 billion machine was heavily damaged by a simple electrical fault.