All of the letters were delivered between 4:00 and 6:30 p.m. on Monday.
A field test done on the powder sent the Uzbekistan Consulate came back negative for Anthrax or any other dangerous substance, New York Police Department spokesman Paul Brown said.
The Health Department is testing the powder and expects to know more on Tuesday.
All three envelopes had Dallas, Texas, postmarks, and at least one contained a note referencing al-Qaida, Brown said.
Officials said 15 people at the French Mission were decontaminated as a precaution. No injuries were reported.
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