A four-alarm fire on the 50th floor of New York City’s Trump Tower left one man dead and six firefighters injured, the FDNY said. The cause of the fire is still unknown.

The NYPD identified the victim as 67-year-old Todd Brassner.

“The apartment was virtually entirely on fire. They pushed in heroically, they were knocking down the fire, they found one occupant of the apartment on the 50th floor,” Fire Commissioner Daniel Nigro said.

The FDNY said that six firefighters suffered injuries. More than 44 units and about 190 firefighters responded.

Nigro said units went up with the Secret Service to check President Trump’s residence. Some smoke reached some of floors above the fire, he said, but it was unclear whether it had reached Mr. Trump’s residence. No members of First Family were in residence.

President Trump tweeted at 6:43 p.m. that the fire had been extinguished, although Nigro said it wasn’t under control due to the smoke conditions on the upper floors.

Trump Tower, which opened in 1984, is located on 5th Avenue and 57th St. in New York City. Before moving to the White House, Mr. Trump, the First Lady and Barron Trump lived in the triplex penthouse apartment, which occupies sections of floors 56-58. The apartments are listed on floors 66-68, although the building is technically only 58 stories.

The headquarters of the Trump Organization are on the 26th floor.

There was a fire at Trump Tower in January. Two people suffered minor injuries in that fire.