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FRANKTOWN, Colo. -- Vandals were caught defacing a popular state park.

Amy Rheinfrank and her husband were nearing the end of the Rim Rock lower trail in Castlewood Canyon State Park on Sept. 1 when something caught their eye.

They saw two men carving into the sandstone cliffs.

“Disappointment, anger, upset that someone would deface our beautiful parks,” Rheinfrank said. “In broad daylight in front of the rest of the hikers."

“It’s disgusting that happens,” hiker Katrina King said.

Rheinfrank shouted for them to stop, but they didn’t listen.

“They turned around and looked at us, said something to each other and they kept doing what they did,” Rheinfrank said.

She took a picture for evidence and called park rangers.

“Just felt my blood pressure go up. That was something that people had done on the property I’m responsible for,” Castlewood Canyon State Park manager Brent Lounsbury said.

Rangers responded to the spot, but the suspects were gone. Lounsbury said the cliff is a problem area for graffiti.

“One of the things with graffiti, people see it and then it gives them the idea that they can do that too. So, unfortunately, that’s one of those issues it tends to propagate itself,” Lounsbury said.

Park rangers were able to resurface the rock and plan to keep a close eye on the area.

Meanwhile, the Rheinfranks hope others will learn from this and help preserve the parks.

“I grew up in Colorado and I want our parks to be as beautiful for my son and future generations as they were to me. It takes all of us to standup for the beauty of our natural parks," she said.

Vandalizing in state parks is illegal. Offenders could face a fine or jail time.