Firefighters were called out to Duncan's Ridge at the Horsetooth Reservoir just after noon Saturday in Larimer County to reports of a small fire at the popular rock climbing destination, authorities say.

Duncan's Ridge is just northwest of County Road 23/County Road 38E and witnesses told first responders that they'd seen a man and two women in the area near the reportedly small fire.

The trio was taking photos and setting off what were described as pyrotechnic smoke bombs for effect. One went off in a woman's hands, causing her to drop it, firefighters say. When she dropped it, it started a small fire.

Climbers and hikers who were close by called fire authorities and put the fire out with water from their water bottles, the Larimer County Sheriff's Office says.

Park Rangers would like the public's help to find the trio suspected of causing the fire.

The man is believed to be in his early to mid-20s with long brown hair and a full beard. He was seen wearing a white shirt and carrying a large camera, authorities say.

One of the women is believed to be in her early to mid-20s with a thin build and blonde hair. She was seen wearing a black shirt and black leggings.

The other woman is believed to be in her 20s with a medium to heavy build, authorities say. She was seen wearing a white sweater and black pants.

One of the women is believed to have a burn on one of her hands, according to deputies.

All three could face a charge of firing woods and prairie, reckless endangerment and various other parks violations.

Anyone with information related to this investigation should call Park Ranger Cindy Kirby at 970-498-5601.

You can also call the Larimer County Sheriff's Office with information at 970-416-1985.

Larimer County Department of Natural Resources Park Rangers and Poudre Fire Authority responded to the fire.