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US officials in Iraq say violence is down since this summer's troop buildup. Now they want to know what role, if any, Iran played in the downturn. Nearly 30,000 more US troops have filed into Iraq since June. Officials say that surge has led to a 55 percent drop in overall violence. One officer says some areas are at their lowest levels in more than two years. The US has accused Iran of arming, training and funding Shiite extremists inside Iraq. But in recent weeks, authorities say Tehran seems to have slowed the flow of weapons across the border. A spokesman says it's too early to determine if this trend will last or something else may be in the works.本文本内容来源于互联网抓取和网友提交，仅供参考，部分栏目没有内容，如果您有更合适的内容，欢迎 点击提交 分享给大家。
