An improperly extinguished campfire is believed to have sparked the June 11 Interlaken wildfire that burned over 400 acres of U.S. Forest Service land in less than 24 hours near Twin Lakes, Colo. Two helicopters and three fixed-wing aircraft worked the fire that day, dropping water and fire retardant on blaze. No structures were lost in the fire, although some of the 250 firefighters working the wildfire have staged at the area’s Interlaken historic district to protect the buildings there.

As of June 19 over 740 acres of Forest Service land have burned in the fire located seven miles southwest of Leadville, and its containment was at 86%.