Michigan Sen. Carl Levin said tests on suspicious letter sent to one of his state offices show no signs it was contaminated with poison.
"I have been advised by the FBI that preliminary testing by the Michigan Department of Community Health, Micro-Biology Laboratory in Lansing showed negative results," the Democratic lawmaker said in a statement Thursday.
"I want to express my appreciation to the local, state and federal authorities who responded to this incident so quickly and professionally."
The senator's Saginaw office, which had been closed Wednesday when the letter was discovered, has reopened.
The letter was one of several pieces of suspicious mail reported by senators this week at Capitol and state offices. Members of Congress have been particularly on edge this week after letters that tested positive with the deadly poison ricin were sent this week to Sen. Roger F. Wicker, Mississippi Republican, and President Obama. Both letters were intercepted at an off-site mail facility.
The FBI on Wednesday arrested Paul Kevin Curtis, 45, of Corinth, Miss., in connection with the letters.
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