New Zealand police said Tuesday they were opening a criminal investigation into the deaths of tourists on a volcanic island where a powerful eruption of ash and scalding steam occurred as dozens of people were exploring the barren landscape.See the huge plume of ash and steam after a New Zealand volcanic island erupts 0:59New Zealand police said Tuesday they were opening a criminal investigation into the deaths of tourists on a volcanic island where a powerful eruption of ash and scalding steam occurred as dozens of people were exploring the barren landscape. Five deaths were confirmed after Monday’s eruption of the White Island volcano. Eight other people are feared dead, but unstable conditions on the island were continuing to hinder a search.Police Deputy Commissioner John Tims did not go into details of the criminal investigation but said it would sit alongside an investigation by health and safety regulators. The announcement indicates authorities are concerned safety standards may have been breached. Many people are questioning why tourists were still allowed on the island after seismic monitoring experts raised the volcano’s alert level last month. A woman places flowers at a fence on the waterfront in Whakatane, New Zealand, on Tuesday. (Mark Baker/Biorports) “These questions must be asked and they must be answered,” Prime Minister Jacinda Ardern said in Parliament. About 47 people were on the island at the time of the eruption, and some of those evacuated suffered critical burns. “To those who have lost or are missing family and friends, we share in your grief and sorrow, and we are devastated,” Ardern said. WATCH: New Zealand PM provides update on volcanic eruption New Zealand Prime Minister Jacinda Ardern outlines the nationalities of those killed when a volcano erupted off the country’s White Island and updates on next steps. 1:03 Experts said they thought there was still a 50 per cent chance of another small eruption taking place within the next day, making it too dangerous for search teams to return to the island. Ardern said aircraft have not seen survivors, and Tims said attempts to send up drones were prevented by windy conditions. The eruption about 2 p.m. Monday sent a plume of steam and ash an estimated 3,660 metres into the air. Helicopter crews landed afterward despite the danger and evacuated many survivors. One of the rescue boats that returned from the island was covered with ash half a metre thick, Ardern said. ‘They had nowhere to go’ Russell Clark, an intensive care paramedic worker, said the scene looked like the Chornobyl nuclear disaster, “just blanketed in ash. “It was quite an overwhelming feeling. There was a helicopter on the island that had obviously been there at the time, with its rotor blades off it,” Clark told New Zealand broadcaster TVNZ. “I can only imagine what it was like for the people there at the time — they had nowhere to go. Floral tributes are placed on a fence at the Whakatane Wharf in New Zealand after a volcanic eruption at White Island on Monday left five people confirmed dead and another eight missing. (Phil Walter/Getty Images) “We didn’t find any survivors on the island,” Clark said. “It would’ve been quite traumatic for them.” Many of the visitors on the island at the time were Australian, and Ardern said New Zealanders and tourists from the United States, China, Britain and Malaysia were also affected. Some of the visitors were passengers from the Royal Caribbean cruise ship Ovation of the Seas. Newlyweds severely burned Australian Prime Minister Scott Morrison said 11 Australians are unaccounted for and 13 were hospitalized. Three Australians were suspected to be among the initial five confirmed dead, he told reporters in Sydney. “I fear there is worse news to come,” Morrison said. Relatives of a newlywed American couple say the husband and wife were severely burned. Barbara Barham told The Washington Post that her daughter Lauren Urey, 32, and son-in-law Matthew Urey, 36, from Richmond, Va., were on a honeymoon trip. Tour guides remove tourists on a boat soon after the eruption of the volcano on a New Zealand island. (@SCH/Reuters) A few locals laid flowers Tuesday at a fence on the waterfront near where the rescue boats had returned with the injured, many of whom were flown to burn units at hospitals around New Zealand. White Island, also known by the indigenous Maori name Whakaari, is the tip of an undersea volcano some 50 kilometres off New Zealand’s main North Island. ‘A terrible place to be’ New Zealand’s GeoNet seismic monitoring agency had raised the volcano’s alert level on Nov. 18 from 1 to 2 on a scale where 5 represents a major eruption, noting an increase in sulfur dioxide gas, which originates from magma. It also said volcanic tremors had increased from weak to moderate strength. It raised the alert level to 4 for a time after Monday’s eruption but lowered it to 3 as the activity subsided. Richard Arculus, an Australian National University volcanologist who has made numerous visits to White Island, said the eruption likely sent a ground-hugging lateral blast from the crater to the jetty, as well as blasting rock and ash vertically skyward. Coast guard rescue boats arrive at the marina near Whakatane on Monday. Search and rescue efforts were on hold Monday because of unstable conditions on the island. (John Boren/Getty Images) “In that crater, it would have been a terrible place to be,” Arculus said. “There would have been nowhere safe for you to be hiding, thinking that: ‘Oh well, if it explodes, it just goes straight up in the air.”‘ White Island is New Zealand’s most active cone volcano. About 70 per cent of the volcano lies under the sea. 12 killed in 1914 Twelve people were killed on the island in 1914 when it was being mined for sulfur. Part of a crater wall collapsed and a landslide destroyed the miners’ village and the mine itself. The remains of buildings from another mining enterprise in the 1920s are now a tourist attraction. The island became a private scenic reserve in 1953, and daily tours allow more than 10,000 people to visit every year. Global Affairs Canada said it is closely monitoring the situation and at this time, there are no reports of Canadians being affected by the volcanic eruption. Tristan Webb, director with a skydiving company in New Zealand, saw the eruption from above. “When we exited the aircraft, pretty much immediately we could see the plume, almost beginning to envelop the entire island,” Webb told CBC News Network. ‘My stomach just dropped’ There were no signs Monday the “steady stream of smoke that we constantly see off the island was any more or any less than what it normally would be,” Webb said. “But it was just very rapid in terms of the way it expanded.” Canadian Sylvain Plasse is aboard a cruise ship that carried some of the tourists who had ventured to the volcano. Plasse, who saw signs of the eruption from Tauranga, said “my stomach just dropped” when he heard the captain’s announcement about what had happened. “It hurts when you think that these people you just talked to last night might be gone now.” The cruise ship, which had left from Sydney last week, was scheduled to sail to the capital Wellington on Monday night, but the company said it would instead remain in the Tauranga port overnight until it learned more on the situation.