The U.S. and South Korea have pinpointed 11 underground sites in North Korea where a third nuclear test could be conducted, a newspaper reported Monday ahead of a summit between the two allies on the communist regime's growing atomic threat.

Gen. Stanley McChrystal, a four-star American general with a long history in special operations, took charge of U.S. and NATO troops in Afghanistan on Monday, a change of command the Pentagon hopes will turn the tide in an increasingly violent war.

Obama concedes to plan that would expand coverage with taxpayer cash but without direct government control