Police, Firefighters Investigate White Powder at NYC Trump Tower

iStock/Thinkstock(NEW YORK) -- A suspicious white powder was discovered at Trump Tower in Manhattan Thursday night, prompting the New York Fire Department, the New York Police Department and EMS workers to investigate.

According to the NYFD, the first responders were called to the Fifth Avenue hi-rise around 8:15 p.m.

The suspicious white powder was discovered on the 5th floor, according to the NYFD. ABC-owned WABC in New York reported the powder was found in the mailroom on that floor.

One police officer and five people were being evaluated as a precaution, according to the FDNY.

A Trump campaign source tells ABC News the 5th floor offices were evacuated, but most of the staff had left for the day.

An active investigation remains ongoing.

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