DENVER - Fire investigators are asking for the public's help in find the cause of a wildfire in Rocky Mountain National Park that started earlier this month.
The Fern Lake Fire west of Moraine Park was first reported on October 9.
According to the wildfire information website inciweb.org, investigators believe those who visited RMNP on Oct. 9 may have information that can help determine both how and where the fire started.
"If you were in the vicinity of the Cub Lake Trail and/or the Fern Lake Trail any time before 2 p.m. on Tuesday, October 9 you may have pertinent information," the website said.
"If you saw anything unusual or noteworthy, investigators would like to talk with you."
Tipsters can contact the National Park Service at 970-586-1399.
The fire is now 670 acres and is 30 percent contained.
It is burning in steep, rugged terrain in mixed conifers with some beetle kill, which has made the fire difficult to fight. Firefighters have had to keep their distance and fight the fire with air resources.
Firefighters have set up two contingency fire lines on the north and east sides of the fire should they decide to start a burnout.
No structures or private properties are threatened.