DENVER - An apartment building in north Denver collapsed during an intense fire early Wednesday morning.
Fire crews got to the building at Marion Street and East 37th Avenue at about 1:20 a.m., according to the Denver Fire Department.
Heavy smoke was coming from the two-story building when 7NEWS arrived at the scene.
There were six to eight separate units inside the building but everyone got out safely, according to Mark Watson with the Denver Fire Department.
Firefighters were in defensive mode at about 2:30 a.m. That means they could not fight the fire from the inside because it was too dangerous.
7NEWS was there as the building began to crumble at about 3:15 a.m.
"The roof of the building and three sides are gone," Watson said.
Later, Watson told 7NEWS that the second floor, and in particular one unit, sustained the bulk of the damage. The investigation, however, is being slowed the concerns the building is structurally unsound.
Crews began to get the fire under control at about 4:15 a.m.