Man dies after falling into Yellowstone hot spring

A 23-year-old man has died after falling into an acidic hot spring at Yellowstone National Park.

Colin Nathaniel Scott, from Portland, Oregon, is believed to have left the designated boardwalk when he slipped and fell into the hot spring in the Norris Geyser Basin, park officials said.

His sister, who was with him at the time, raised the alarm.

The death occurred in one of the hottest and most volatile areas of Yellowstone. Water temperatures there can reach 93C (199F), the boiling point for water at the park's high elevation.

Rangers are unlikely to be able to recover his body due to the high temperature and acidic nature of the spring.

The basin is a popular attraction in the nation's first national park, which received a record 4.1 million visitors last year.