NEW YORK (AP) " A raging fire that tore through a 50th-floor apartment at Trump Tower on Saturday killed a man inside and sent flames and thick, black smoke pouring from windows of the president's namesake skyscraper.

New York Fire Commissioner Daniel Nigro said the cause of the blaze is not yet known but the apartment was "virtually entirely on fire" when firefighters arrived after 5:30 p.m.

Sixty-seven-year-old Todd Brassner, 67, who was in the apartment, was taken to a hospital and died a short time later.

Officials said four firefighters also suffered minor injuries. An investigation is ongoing.

Shortly after news of the fire broke, Trump, who was in Washington, tweeted: "Fire at Trump Tower is out. Very confined (well built building). Firemen (and women) did a great job. THANK YOU!"