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CHEYENNE, Wyo. (AP) — Yellowstone National Park rangers have not been able to contact or locate a group of Canadian men accused of walking onto a sensitive hot spring. Yellowstone spokeswoman Charissa Reid says it's possible they have returned to Canada. Rangers filed a criminal complaint Monday against three members of the group known as High on Life SundayFundayz for leaving an established boardwalk and stepping onto a geothermal feature where they snapped selfies and took video of themselves last Saturday. The group posted an apology on its website and social networks, expressing regret for their actions and offering to donate up to $5,000 to the park. Messages to the group seeking comment have not been answered. A spokesman for the U.S. Attorney's Office in Wyoming was not available Wednesday.

Yellowstone assessing damage to hot spring from video-makers