WELLINGTON, New Zealand—A search-and-rescue operation is under way to find tourists who were visiting a New Zealand volcano when it erupted on Monday.

New Zealand police said up to 50 people were on or near White Island, also known as Whakaari, when the volcano erupted at 2:11 p.m. local time. Prime Minister Jacinda Ardern had earlier said about 100 people were thought to be in the area at the time.

“Some…

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