DEVELOPING: A hydrothermal eruption caught on camera sends tourists fleeing the boardwalk at Biscuit Basin.

　　(Video/Vlada March)

　　The National Park Service released the following information:

　　On Tuesday, July 23, at about 10:19 a.m., a localizedhydrothermal explosionoccurred near Sapphire Pool in Biscuit Basin, located just north of Old Faithful. Biscuit Basin, including the parking lot and boardwalks, are temporarily closed for safety reasons. The Grand Loop Road remains open. No injuries were reported, and the extent of damage is unknown at this time.  Park staff and staff from USGS will monitor conditions and reopen the area once deemed safe. No other monitoring data show changes in the Yellowstone region. Today’s explosion does not reflect a change in the volcanic system, which remains at normal background levels of activity. This is an evolving incident, and additional details will be shared as more facts are known. Learn more about Yellowstone’s geology at Geology — Yellowstone National Park U.S. National Park Service GearJunkie will continue to update this story as more information becomes available.