Gusty winds in Houston Tuesday turned what had been a small rooftop fire into a massive blaze that destroyed a large apartment complex under construction near the city's downtown, authorities said.

The five-alarm fire gutted the 396-unit, 4 1/2-acre Axis Apartments project in the city's hip Montrose district. The roof and the shell of the expansive structure collapsed as the flames turned it into a charred ruin.

Houston Apartment Fire

Firefighters worked for 2 1/2 hours to get the blaze under control. (Mayra Beltran/Houston Chronicle/Associated Press)

All construction workers who had been in the high-rise building were accounted for, and no injuries have been reported. One man was rescued as he prepared to jump to safety, Fire Capt. Ruy Lozano said.

Nearby observer Karen Jones captured the man's escape on video with her cellphone, filming as the worker jumped from a higher-level partially completed balcony to one below and climbed onto a fire truck ladder moments before part of the building collapsed. The video was later posted on YouTube and has been viewed several hundred thousand times.

Took 2 1/2 hours to contain

Fire officials said more than 200 emergency personnel battled the fire for 2 1/2 hours before bringing it under control.

Houston Apartment Fire

Strong wind gusts Tuesday turned a small rooftop fire into a massive five-alarm blaze. (Mayra Beltran/Houston Chronicle/Associated Press)

Witnesses said the fire started about 12:30 p.m. Tuesday on the northeastern corner of the roof but spread rapidly through a breezeway.

"There was a report of a couple of guys working on the roof doing welding," Houston Fire Department deputy chief Greg Lewis said. "When our units arrived, there was a small fire and construction workers were attempting to put it out. There was sustained wind of 15 to 20 miles an hour, and it was a wind-driven fire."

The cause of the fire is still under investigation, Lozano said.

The department said the blaze that sent thick, black smoke billowing in to the sky prompted the evacuation of nearby buildings.

Firefighters also sprayed nearby houses and apartment buildings with water to prevent heat and embers from spreading the fire. No other buildings were damaged, but plastic fixtures melted on some nearby vehicles.