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A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt an estimated 100 feet into the sky and sent people running for safety.

A wrecked boardwalk and debris are pictured after the Yellowstone Park explosion, with the blast itself seen in the inset. Some of the rocks thrown out by the explosion were around 3 feet wide.

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt an estimated 100 feet into the sky and sent people running for safety.

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt an estimated 100 feet into the sky and sent people running for safety.

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt an estimated 100 feet into the sky and sent people running for safety.

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt an estimated 100 feet into the sky and sent people running for safety.

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt an estimated 100 feet into the sky and sent people running for safety.

CHEYENNE, Wyo. — A surprise eruption that shot steam, water and dark-colored rock and dirt dozens of feet into the sky Tuesday sent people running for safety in Yellowstone National Park.

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt an estimated 100 feet into the sky and sent people running for safety.

CHEYENNE, Wyo. (AP) — A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt high into the sky Tuesday and sent sightseers running for safety. The ...

CHEYENNE, Wyo. (AP) — A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt high into the sky Tuesday and sent sightseers running for safety. The ...