A volcano has erupted in New Zealand, leaving one dead and several unaccounted for, police have said.

Tourists were seen walking inside the rim of the White Island crater just moments before the eruption.

Police said 23 people had been rescued, but warned the number of dead was "likely" to rise. The area is currently too dangerous for a rescue operation.

White Island, also known as Whakaari, is one of the country's most active volcanoes.

Despite that, the island is a tourist destination with frequent day tours and scenic flights available.

Visitor Michael Schade - who was on a boat leaving the island after a morning tour - filmed a thick plume of ash and smoke as the volcano erupted.

He told the BBC he was at the crater just 30 minutes before the eruption.

"It was still safe-ish but they were trying to limit the group sizes [of people visiting the volcano]."

Describing the eruption, he said: "We had just got on the boat...then someone pointed it out and we saw it. I was basically just shocked.

"The boat turned back and we grabbed some people that were waiting on the pier."

A live feed from the volcano showed a group of visitors inside the crater before images went dark.

BBC