A massive fire tore through a three-story apartment complex under construction in southeast Denver, drawing more than 100 firefighters to the scene.

Firefighters battled the blaze for hours on Friday evening as flames and heavy smoke engulfed the building near the Glendale area, Denver Fire officials said.

Robert Murphy, division chief of operations for Denver Fire, described the incident as a rare and extreme event for the city, calling it a five-alarm fire. He said more than 100 firefighters were deployed, with assistance from surrounding metro agencies.

The fire was still burning more than two hours after it began, with crews continuing to pour water onto deep-seated flames inside the structure. One major road, Leetsdale Drive, was closed in both directions as emergency crews worked at the site.

Authorities reported no injuries. However, residents of a nearby apartment building were advised to evacuate due to intense heat from the fire.

The Colorado Division of Homeland Security and Emergency Management said the blaze caused significant power outages in the area. Officials opened a temporary overnight shelter at an event center in nearby Glendale.

Aerial footage from local media showed emergency vehicles surrounding the site as firefighters used tower ladders to douse the flames. 

The cause of the fire remains under investigation, according to local authorities.

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