袭击发生后，FBI和美国邮政检查服务局成立了一个工作队来调查谁是幕后黑手。
After the attack, the FBI and the U.S. Postal Inspection Service set up a task force to investigate who had done it.
袭击发生后，FBI和美国邮政检查服务局成立了一个工作队来调查谁是幕后黑手。
After the attack, the FBI and the U.S. Postal Inspection Service set up a task force to investigate who had done it.
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