By Adrian Croft BAGHDAD (Reuters) - A roadside bomb killed three U.S. soldiers and an interpreter in a region of northern Iraq where U.S. and Iraqi forces are battling al Qaeda, the U.S. military said on Wednesday. Tuesday night's attack, which brought the number of U.S. soldiers killed in Iraq this week to seven, suggests al Qaeda remains a threat in the northern city of Mosul and the surrounding province of Nineveh. The U.S. military said the attack happened in Nineveh province but gave no other details. U.S. and Iraqi forces have been carrying out intensive operations against al Qaeda in the Mosul area for weeks, aiming to stamp out the Sunni Arab insurgents in a city U.S. officials say is their last major urban stronghold. U.S. Ambassador to Iraq Ryan Crocker said last month that al Qaeda in Iraq had never been closer to...
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