Appears this one is human caused:
Human caused.
Public input sought on cause of Mullen Fire
(LARAMIE, Wyo.) September 20, 2020 – The Mullen Fire began on Thursday, Sept. 17, 2020 in Savage Run Wilderness, Medicine Bow National Forest. The USDA Forest Service is actively investigating the cause of the fire. The origin area of the Mullen Fire has been identified and preliminary information indicates that the fire could be human caused. The fire remains under investigation.
Law enforcement officers from the Forest Service are requesting public assistance with the ongoing investigation. If you have first-hand information on activity occurring in the eastern area of Savage Run Wilderness, in the South Mullen Creek drainage, please call the Medicine Bow National Forest – Laramie Ranger District anonymous tip line at 307-745-2392.
When calling the tip line, select option 5 (“to report any other information”). Please provide information about the date, time, location, and any identifying facts about the activity. You are not required to leave your name or contact information, but it can be helpful in identifying responsible individuals.
Currently, and at the time of fire ignition, the forest is in Stage II fire restrictions, meaning no campfires.
Official source of information for this fire is InciWeb,
https://inciweb.nwcg.gov/incident/7208/.
-USDA-
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Forest Service Shield
Aaron Voos
Public Affairs Specialist
Forest Service
Medicine Bow-Routt National Forests & Thunder Basin National Grassland
p: 307-745-2323
c: 970-819-2898
[email protected]
2468 Jackson St.
Laramie, WY 82070
www.fs.usda.gov/mbr
Twitter.com/FS_MBRTB