Officials in New Zealand have filed charges against 10 businesses and three people after an investigation into a volcanic eruption that left 22 dead.

The surprise eruption on White Island, also known by its Maori name of Whakaari, also injured dozens of people on 9 December last year.

The majority of those killed and injured were tourists from countries including Australia, the United States and Malaysia.

They were on board a cruise ship that was travelling around New Zealand. There were 47 people on the island when the volcano erupted.

Questions were raised at the time as to why people were allowed on the island, a popular destination for day-trippers, given there was reported to be a heightened risk of an eruption.