Discuss as:

Colorado's most destructive wildfire mostly contained as officials welcome rain

Marcio Jose Sanchez / AP

From left, Black Forest resident Kristin Brown, whose family lost their home in the wildfire, is joined by Ashley Clipp, Kaitlyn Barlow and Ashley's son Jackson, 2, as they support first responders outside of a fire camp in Colorado Springs, Colo., on Sunday.

The most destructive wildfire in Colorado’s history is 75 percent contained and expected to be fully under control by Thursday, officials in Colorado Springs said Monday.

Since the Black Forest Fire started on Tuesday, 480 structures have been destroyed, but the mandatory evacuation zone was reduced Monday morning, according Jennifer Brown, an El Paso county public information officer.

Although Brown said more areas are being cleared for displaced residents to return, The Associated Press reported that people whose houses are in areas where the fire did the most damage may be delayed by fire investigators. 

The cause of the fire is still unknown and evidence in those areas could help officials determine what or who started the blaze.

The Black Forest fire raging in Colorado is now the state's most destructive wildfire ever.

While officials said that three subsequent wildfires may have been caused by lightning strikes, at the time when the Black Forest Fire started, lightning hadn’t been an issue, so the fire is believed to be a result of a person or machine.

Meanwhile thunderstorms were bringing welcome rain as they helped firefighters contain the fire further on Sunday and Monday, and more showers were forecast into the week.

In the midst of firefighters extinguishing the remaining fires, the Sheriff’s office is focused on damage assessment of structures and cleanup, to prepare for more people to return to their homes. However, according to KUSA, an NBC affiliate in Colorado, even those who are allowed back into their homes, or allowed to retrieve what they can from the rubble, still “must be ready to go at a moment's notice.”

Two deaths were caused by the wildfire, officials said, but the Sheriff’s department has yet to release their names. The two who lost their lives were in the midst of packing up belongings from their garage when it collapsed on them, officials said.

Firefighters give reporters their first glimpse of devastation left in the wake of Colorado's Black Forest fire as they work to douse lingering hot spots. KUSA's Todd Walker reports.

The Associated Press contributed to this report