American military helicopters hovered over some of the bomb sites, as clouds of black smoke billowed over Baghdad's skyline.
美国军用直升机在部分爆炸地点上空盘旋，浓重的黑烟笼罩着巴格达的上空。
Footage from security cameras near the bomb sites could help investigators.
爆炸现场附近监控摄像头拍到的录像可能有助于调查人员了解情况。
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