A fifth foreign mission to the United Nations has received an envelope with a suspicious white powder inside, police say.

The mission to the United Kingdom reported receiving the envelope Tuesday at its One Dag Hammarskjold Plaza offices, on Second Avenue and East 47th Street.

Hundreds of workers were evacuated from the office tower after the envelope was found Tuesday afternoon.

"I was scared," said Lindsey Morrone, who works on the 16th floor. "There were people in the office walking around with napkins over their faces, in fear that the spores could be spread through the ventilation system."

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The German mission to the UN got a similar package earlier Tuesday. Three other envelopes arrived Monday at the missions of France, Austria and Uzbekistan.

Initial tests show none of the envelopes contain anthrax or any hazardous substance, NYPD spokesman Paul Browne said.

He says three of the five envelopes contained notes referring to the al-Qaida terror network and mentioned the FBI. At least four of the envelopes had Dallas postmarks.

Morrone said she doesn't know whether her office will be open Wednesday. "I was going to get a package delivered to me at the office tomorrow, but I'm going to send it somewhere else."

FBI spokesman Richard Kolko says his office is trying to locate the sender.

As a precaution, hazardous material units decontaminated employees who handled the envelopes.