An accident involving a semi-truck hauling gasoline forced closure Thursday of the road between Mud Volcano and Fishing Bridge Junction in Yellowstone National Park.

A semi-truck hauling gasoline overturned in Yellowstone National Park, forcing closure Thursday of the road between Mud Volcano and Fishing Bridge Junction.

A brief park release said park crews were helping with hazmat cleanup, though there were no details on when or how the truck overturned how much, if any, gasoline was spilled and whether it reached the Yellowstone River, and when the road might reopen.