A wildfire several miles west of Larkspur on U.S. Forest Service land, known as the East Plum fire, has burned about one acre as of 7 p.m. Thursday, according to Fire Information Coordinator for the Rocky Mountain Area Coordination Center Larry Helmerick. 

An air tanker dropped retardant on the fire but a containment line has not been set, according to Helmerick. 

Air containment operations had to be stopped when someone flew a drone over the area, Helmerick said.

“Please be careful as 80% of forest fires are human-caused,” Helmerick warned.