Four Canadian men have become the center of a Yellowstone National Park law enforcement investigation after they posted photos and video of themselves walking on the Grand Prismatic Spring and the nearby crater of the Excelsior Geyser.

The men, tagged on Facebook as Justis Cooper, Alexey Lyakh, Hamish McNab Campbell Cross and Ryker Gamble, have posted extensively in recent weeks about what they dubbed “The Great American Road Trip,” which included a recent stop in Yellowstone.

Watch a clip of their video here.

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