A hydrothermal explosion occurred at Yellowstone National Park’s Biscuit Bay on Tuesday, shocking visitors.

Tourists walking along the boardwalk captured the explosion on video, with people closest to the eruption running away as smoke and debris engulfed part of the boardwalk.

Vlada March posted a video of the explosion to social media. The blast appeared to originate near the Black Diamond Pool.

“Boardwalk destroyed, my mom got some of the debris but everyone is safe. Unbelievable and grateful to be alive,” March wrote.

No injuries were reported.

The U.S. Geological Survey reported Biscuit Bay is currently closed.

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Hydrothermal explosions are not a result of volcanic activity but instead occur when superheated water rapidly flashes to steam underground. It is a common occurrence at Yellowstone, USGS reported.

“Hydrothermal explosions like that of today are not a sign of impending volcanic eruptions, and they are not caused by magma rising towards the surface,” USGC wrote.