Smoke could be seen coming from the Fifth Avenue building just after 7 a.m.
Here's video showing the dark smoke billow from the top of the tower:
FDNY officials said the small fire started in a heating and cooling unit.
A firefighter suffered a minor injury when debris fell on him. Two civilians also suffered some minor smoke inhalation, but refused medical attention.
Fire officials said the fire was contained to the roof and never entered the building.
President Donald Trump's son, Eric Trump, took to Twitter to thank first responders.
There was a small electrical fire in a cooling tower on the roof of Trump Tower. The New York Fire Department was here within minutes and did an incredible job. The men and women of the #FDNY are true heroes and deserve our most sincere thanks and praise! https://t.co/xuTmq1GBbj— Eric Trump (@EricTrump) January 8, 2018
The building was not evacuated during the ordeal.
Trump Tower, located at 721 Fifth Avenue, is home to President Trump's family and is protected by Secret Service.
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