KITTREDGE, Colo. (CBS4) – Jefferson County deputies are investigating a case of trail vandalism.

Graffiti spray-painted onto rocks and trees was discovered last week at O’Fallon Park near Kittredge.

O’Fallon Park is one of the Denver Mountain Parks. It features hiking along Bear Creek dotted by miniature waterfalls.

“It seems odd that somebody would want to even bring their can of spray paint out here,” hiker Jennifer Seib said. “Nobody is going to see it driving by.”

They defaced not only trees, but rocks and railings.

“It makes me feel really upset, disappointed that somebody that would disrespect our beautiful state like this,” hiker Jessica Seur said.

Just recently a vandal was caught in the act of spray-painting rocks on Lookout Mountain. After he was caught he said he didn’t know he was doing anything wrong.

Elsewhere, claiming it was art, a California woman eventually pleaded guilty to vandalizing rocks in national parks, including Rocky Mountain National Park.

In Jefferson County, no one is calling it art.

“My first reaction is to string them up in the trees that they painted,” hiker Pat Sanders said.

It was not the first time O’Fallon Park has been hit.

What is likely to go down as a simple case of vandalism perhaps could better be labeled as a crime against nature.