New Zealand volcano erupts: 6 killed, 8 others feared dead after eruption on White Island

WATCH: Deadly New Zealand volcano eruption

WHITE ISLAND, New Zealand — At least six people have died after a volcano erupted Monday on New Zealand's White Island, officials said.

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Here are the latest updates:

Update 5:46 a.m. EST Dec. 10: A sixth person has been confirmed dead after a volcano erupted on New Zealand's White Island on Monday afternoon, authorities said Tuesday.

Eight more people are feared dead on the island, but rescue crews can't return to recover the bodies yet due to unsafe conditions, The Associated Press reported.

Update 3:10 p.m. EST Dec. 9: Citing tour operators, New Zealand Police said eight people remained unaccounted for Tuesday morning local time, hours after White Island erupted.

Officials said 31 people were being treated at seven hospitals. Three other people were treated and discharged from Whakatane Hospital.

Authorities said those impacted by Monday's eruption included New Zealanders and overseas tourists, including 37 passengers and a crew member from Royal Caribbean's Ovation of the Seas cruise ship.

Police expect aerial searches of the area to continue Tuesday.

Original report: According to New Zealand police, 50 or fewer people, including more than 30 passengers on Royal Caribbean International's Ovation of the Seas cruise ship, were in the area when the volcano erupted just after 2 p.m. local time Monday, CNN reported. Of the 23 people evacuated, five have died, and many of the 18 survivors were being treated for burn wounds, The Associated Press reported.

In a Monday night news conference, New Zealand police Deputy Commissioner John Tims said he was not sure how many people remain on the island but estimated that it was a double-digit number, the AP reported. Rescuers are not yet able to search the island because "the physical environment is unsafe," Tims said.

Police have not released the nationalities or identities of the victims and the missing; however, the Guardian reported that at least 20 are Australian. Officials also believe that "overseas tourists" and New Zealand residents were affected, according to the AP.

Royal Caribbean issued a statement saying it is "devastated" by the eruption and offering sympathy to "those affected by this tragedy," CNN reported.

"We are working together with local authorities, and we are providing all the help and care we can to our guests and their families, including offering medical resources and counseling," the statement read. "We are also sending staff members from both our ship and our Sydney and Auckland offices to assist family members however possible."

The cruise line added that the "Ovation of the Seas will remain in port as long as needed to assist with the situation," according to CNN.

– The Associated Press contributed to this report.