Workers at a Planned Parenthood clinic in Clermont County turned a suspicious envelope over to the FBI Monday, fearing it contained deadly anthrax.

        The envelope matched the description of envelopes containing threatening letters and a powdery substance that have been sent to at least 90 Planned Parenthood clinics and offices nationwide over the past two days.

        In Dayton, Ohio, about 40 Planned Parenthood of the Greater Miami Valley workers were evacuated Tuesday after a suspicious letter was received at their office. Fire officials removed the unopened letter to be analyzed later.

        An envelope containing a white powder also was opened at a Planned Parenthood office in Youngstown.

        “We heard about this letter from another Planned Parenthood center, so when it came to one of our centers, we picked it out based on the description,” said Sue Momeyer, CEO of Planned Parenthood of Southwest Ohio and Northern Kentucky.

        The FBI office in Cincinnati said the Clermont County envelope was still undergoing tests to determine whether it contains anthrax. Results could be in thisafternoon, a spokesman said.

        Ms. Momeyer said the envelope had several unusual characteristics that raised suspicions among mailroom workers.

        The return address on the envelope, for example, didn't match the postal stamp identifying the city from which it was mailed, Ms. Momeyer said.

        Most Planned Parenthood centers examine mail with extreme scrutiny because many of the centers have been the targets of anthrax attacks in the past, she said.

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