The Marksheffel fire burning east of Peterson Space Force Base and Colorado Springs Airport is 100% contained as of Tuesday afternoon, according to the Colorado Springs Fire Department.

Investigators believe the 640-acre grass fire was started accidentally by chains dragging behind a vehicle, the fire department said in an update Monday afternoon.

At least 10 Colorado Springs fire units and units from two other departments, Ellicott Fire Protection District and Cheyenne Mountain Fire & Emergency Services, responded to the fire in the area of Marksheffel and Drennen roads Sunday evening.

Fire crews secured a perimeter around the fire by 6:30 p.m. Sunday and got the fire to 90% containment by 11 a.m. Monday, according to an update on X.