Güncelleme Tarihi:
The three belong to an insurgent group called Katai'b Hezbollah, the U.S. military said in a statement. Four other suspected members of the group were detained on Monday. Â
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The U.S. military said forces launched early morning raids in Baghdad's Karrada district. At one residence, two suspected leaders of a Katai'b Hezbollah cell were detained without incident.
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At a second location, a man attacked U.S.-led forces as they tried to enter a building and was killed, it said.
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The U.S. military said Katai'b Hezbollah was thought to be a "surrogate" of Iran, a long-time foe of the United States.
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U.S. troops have caught more than 30 suspects the U.S. military says are sponsored by Iran in the last four weeks.
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Washington accuses Shi'ite Iran of arming, funding and training fighters who attack U.S. and Iraqi security forces.
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Iran denies the charge and blames the U.S. military presence in Iraq for bloodshed between majority Shi'ites and once dominant Sunni Arabs that followed the U.S.-led invasion in 2003. Iraq's Sunni Arabs initially sided with al Qaeda in opposing U.S. troops.
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Last month U.S. forces released an Iranian construction official seized in Baghdad on suspicion of belonging to Iran's Revolutionary Guards and of smuggling weapons into Iraq.
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An Iranian embassy official said arresting forces had confused a packet of salt in his luggage for cocaine.