一个由联邦调查局、国内税收局和美国邮政检查局进行的调查导致了上个月的逮捕。
An investigation by the FBI, the Internal Revenue Service and the U. S. Postal Inspection Service lead to the arrest last month.
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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