Eight people are now known to have died in Tuesday's speedboat accident off the eastern coast of Thailand.
At least 12 others are still missing, but police remain unsure exactly how many people were in the boat.
Three of the dead were Britons, one was American and the other four were Thais, according to police sources.
The accident happened as the boat was taking passengers to Samui island from nearby Pha Ngan, where revellers had gathered for an all-night beach party.
The body of Thai national Pratthana Songmuang, 25, was found entangled in fishing nets on Wednesday, bringing the number of confirmed dead to eight.
But the number of casualties is likely to go up, with Lieutenant Colonel Tharathorn Pasupradit, deputy commander of Surat Thani marine police, saying he did not hold out much hope for those still reported missing.
" The information about missing people is very sketchy because the people we have talked to often don't know whether their friends or relatives were on that boat "
"We are now focusing on searching for dead bodies, not survivors," he told the French news agency AFP.
The missing are thought to include five Thais, two Australians, two Americans, a Briton, a Swiss and a German.
Overcrowding
The boat's 26-year-old driver, Samran Rungruen, who disappeared immediately after Tuesday's accident, has now turned himself in to police.
He is said to have blamed the accident on a mechanical problem, but Thai marine police said they suspect it may have been caused by overcrowding.
Between 40 and 45 people are thought to have crammed into the boat, which was not meant to carry more than 30 passengers.
According to Reuters news agency, Samran Rungruen faces manslaughter and negligence charges, and could face jail of up to 10 years if found guilty.
On the island of Samui, police are continuing to interview tourists to get a clearer idea of who remains unaccounted for.
"The information about missing people is very sketchy because the people we have talked to often don't know whether their friends or relatives were on that boat," said Korjaru Sangamantorn, from the marine police.
Tuesday's accident is yet another setback for Thailand's tourist industry, which is still reeling from last month's tsunami that killed more than 5,300 people in Thailand, half of them foreign holiday-makers.
Samui and Pha Ngan were not affected by the tsunami, and the area is currently crowded with foreign holidaymakers who have transferred from resorts on the devastated western coast.
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