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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 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.

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.