Federal investigators later said the engineer on the commuter train was sending.

联邦调查人员后来说事发几秒钟前，客运列车上的工程师正用手机发着短信。

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Military investigators later discovered a local police chief had helped carry out the attack.

随后调查人员发现当地警察参与策划了该袭击。

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Investigators later found a news clipping about the explosion and DVD copy of Fight Club in his bedroom.

随后，调查人员在萧的卧室里发现了上次爆炸的新闻简报和《搏击俱乐部》的DVD光盘一张。

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Investigators later discovered that he had been inspired by al-Awlaki's preaching about violent jihad.

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Investigators later ruled the crash an accident, saying he fell asleep at the wheel.

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Investigators later determined that the shooter was fleeing a failed robbery of a diamond courier.

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