A Hawaii national park has issued a new warning to tourists after a toddler was grabbed “in the nick of time” from falling off the rim of an erupting volcano.

The little boy wandered off from his family and “in a split second, ran straight toward the 400ft cliff edge” of the Kilauea volcano, the park said.

“His mother, screaming, managed to grab him”, the park added in its statement, when the toddler was “just a foot or so away from a fatal fall”.

Park ranger Jessica Ferracane, who observed the incident, told the BBC she hopes sharing details of the incident will help “prevent future tragedies”.

Kilauea, on Hawaii’s Big Island, is one of the world’s most active volcanoes.

It routinely erupts, and the latest eruption began on 23 December with lava pictured gushing to the surface.

The eruption is continuing at a low level within a closed area of the national park, the USGS Hawaiian Volcano Observatory said in its latest update on Saturday.

The park said the incident happened on Christmas Day in a closed area of the park where families had gathered to watch the lava.

It was in an area overlooking the caldera – the large crater of the volcano – and the boy would not have survived the fall, Ms Ferracane said.

Park rangers said they want to remind visitors to stay on trail and out of closed areas, and to keep their children close.

“Those who ignore the warnings, walk past closure signs, lose track of loved ones, and sneak into closed areas to get a closer look do so at great risk.”

Ms Ferracane added: “Hopefully sharing the news will prevent future tragedies and near-misses.”