BAGHDAD, Iraq (CNN) -- A top special operations officer from Lebanon's Iranian-backed militia Hezbollah has been captured in Iraq, where U.S. officials say he played a key role in a January attack that killed five Americans. Ali Mussa Daqduq, an explosives expert, was captured in March in the southern Iraqi city of Basra, where he was helping train and lead Shiite militias fighting coalition troops, U.S. intelligence officials told CNN. Daqduq pretended to be deaf and mute when captured, and his identity was not known for weeks, the officials said. Once uncovered, however, they said he began to talk, and...