Yellowstone and Grand Teton National Park have seen a growing number of people operating personal drones inside park territory.
Last week someone crashed their drone into Yellowstone's Grand Prismatic Hot Spring. Park spokesperson Al Nash says the park has struggled to recover the device.
“So far we haven’t been able to spot it. We are actually considering flying an authorized manned helicopter over it to see if we can spot it from the air.”
Last week an employee of Grand Teton issued a citation for drone use, a first for that park.
Drones have been largely illegal in all US National Parks since June.