KABUL (AFP) - A bomb attack killed two US soldiers in the volatile southern region of Afghanistan, pushing the death toll of foreign troops in the country to over 50 for the year so far, NATO said Wednesday. In a brief statement, NATOs International Security Assistance Force (ISAF) said the two soldiers were killed on Tuesday. Two ISAF service members from the United States were killed yesterday in an IED strike in southern Afghanistan, it said, referring to an improvised explosive device. The icasualties.org website puts the toll for 2010 at 51. An ISAF spokesman confirmed that six foreign soldiers have been killed this month.