New York City police say the mission to the United Kingdom was the last to receive a letter. 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.
NYPD spokesman Paul Browne says tests revealed the substance contained in those three letters was flour. Test results are pending on the other two letter.
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, Texas postmarks.
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.
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