Waldo Canyon Fire, Colorado Springs
The FBI will work with state and local law enforcement to determine whether the aggressive Waldo Canyon Fire was a result of criminal activity. This map shows the extent of the fire burning in Colorado Springs. InciWeb

The cause of the Waldo Canyon Fire burning in Colorado Springs is still unknown, but the FBI is joining local and state law enforcement to determine what sparked it.

FBI spokesman Dave Joly said the Denver Division is working to determine if any of the wildfires burning in Colorado were a result of criminal activity.

FBI personnel are supporting command post operations in the fire regions and offering assistance with managing the volumes of information related to these tragic events, Joly said in an email to the IBTimes.

9News reported that in nearby Teller County, investigators have been working on several fires that are believed to have been the work of an arsonist.

The Waldo fire began on Saturday in the Pike National Forest, El Paso. It has since burned more than 18,000 acres of land, displaced approximately 32,000 people and destroyed and estimated 300 homes.

The aggressive Waldo fire is still only 5 percent contained. Officials expect to get it under control by July 16. Brush, mountain shrubs, wind and hot temperature are fueling the fire, which has cost $3.2 million so far.

President Barack Obama is scheduled to visit the area Friday to view the damage. He also said resources will be made available to respond to the fires currently burning in Colorado and other western states.

According to the White House, 17 air tankers have been taking on the western wildfires over the last two days. There are more than 8,400 personnel, 578 fire engines and 79 helicopters working to put out the wildfires that are raging across the nation. More than half of the active federal wildfire-fighting resources are being used in Colorado.

Alaska, Arizona, California, Montana, Nevada, New Mexico, Utah and Wyoming are other states battling wildfires.