LOWER MANHATTAN, N.Y. (PIX11) -- The Federal Bureau of Investigation announced Thursday night it is investigating five envelopes containing an unknown white powder found at a federal building in Lower Manhattan.

The letters were found in the mailroom of Enforcement and Removal Operations on the ninth floor at 26 Federal Plaza at around 4 p.m., authorities said.

Within minutes, FDNY Hazmat, Emergency Medical Services, and the New York City Emergency Management Department were at the scene.

"This is what we train for," NYC Deputy Mayor for Public Safety Kaz Daughtry said in a press conference. "Today's event was under control, almost immediately, without incident. While we are fortunate there are no injuries at this time, we are awaiting the test results to determine the contents of the e

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