New York City Fire Department vehicles sit on Fifth Avenue in front of Trump Tower, in New York. Picture: Richard Drew/AP
New York City Fire Department vehicles sit on Fifth Avenue in front of Trump Tower, in New York. Picture: Richard Drew/AP
The New York City Fire Department says the fire started around 7 a.m. Monday in the heating and air conditioning system of the Trump Tower building on Fifth Avenue in Manhattan. Picture: Richard Drew/AP
The New York City Fire Department says the fire started around 7 a.m. Monday in the heating and air conditioning system of the Trump Tower building on Fifth Avenue in Manhattan. Picture: Richard Drew/AP
New York City Fire Department vehicles sit in front of Trump Tower, in New York. Picture: Richard Drew/AP
New York City Fire Department vehicles sit in front of Trump Tower, in New York. Picture: Richard Drew/AP
Trump Tower, in New York  Picture: Richard Drew/AP
Trump Tower, in New York Picture: Richard Drew/AP

New York - Two people were injured, one seriously, in an early-morning fire near the top of Trump Tower in midtown Manhattan, the New York Fire Department said on Monday.

US President Donald Trump was in Washington at the time.

Although local media initially reported there were no injuries, one person sustained a serious, possibly life-threatening injury, and another had a minor injury, the Fire Department said.

Eric Trump, one of the president's sons, said on Twitter that it was a small electrical fire in the cooling tower on the building's roof.

Read: WATCH: Fire on top floor of Trump Tower

"The New York Fire Department was here within minutes and did an incredible job," said the younger Trump. "The men and women of the #FDNY are true heros and deserve our most sincere thanks and praise!"

The fire was reported by phone shortly before 7 a.m. EST (noon GMT) on the top floor of the 68-story structure, which had been Trump's primary residence before his election victory and inauguration nearly a year ago, the department said.

More than 90 minutes after the initial report, 84 firefighters and 26 units were still on the scene, according to department spokesman Firefighter Ken Reilly.