Four more Americans have been killed in Afghanistan, making July the deadliest month ever for US troops in the conflict.
A NATO statement said the four were killed Monday when a roadside bomb exploded in eastern Afghanistan. The statement did not give nationalities, but US spokesman Lt. Robert Carr confirmed all four were Americans.
At least 30 US troops have now died this month - two more than the toll for June 2008, which had been the deadliest month for the American force in Afghanistan.
At least 55 international troops have been killed in Afghanistan in July, the deadliest month of the war for the NATO mission.