The grass fire that burned more than 640 acres east of the Colorado Springs Airport and Peterson Space Force Base on Sunday and Monday has been declared 100% contained.

The Colorado Springs Fire Department announced full containment via a social media post around 12:30 p.m. Tuesday. 

“Again we want to thank all of our regional partners for their hard work and assistance on keeping this fire away from homes, the COS Airport, Peterson Space Force Base and other major areas of our city,” reads the department’s post. 

Investigators for the fire department reported Monday afternoon that the cause of a brush fire that burned at least 640 acres east of the city was likely accidental, caused by chains dragging from a vehicle driving along an area road.

The blaze began Sunday afternoon with at least four patches of grass fires that eventually combined. The fires were first reported around 4:15 p.m. Sunday near Marksheffel Road and Drennan Road.

In addition to 21 CSFD units and about 40 personnel, crews from Black Forest, Cimarron Hills, Cheyenne Mountain, Ellicott and Peterson Space Force Base were on scene securing a perimeter around the fire, officials said. Colorado Springs Utilities, El Paso County Sheriff’s Office, Colorado Springs police and State Patrol also assisted.

Colorado Springs Airport operations were not impacted by the fire. No evacuation warnings were necessary, officials said.

An abandoned barn was burned to the ground, but no other structures were damaged, and no one was injured in the fire according to the fire department.

The past two weeks have seen an uptick in area grass fires, most notably near the Air Force Academy and on Fort Carson land.