A rescued woman wearing a life jacket hugs a man after a boat capsized off the tourist island of Phuket, Thailand July 5, 2018 in this still image taken from video.
The first body was found early Friday, and 12 more were found just before noon, according to Thai News Agency.
The governor of Phuket said strong winds were hampering the search, which began Thursday when the boat-carrying mostly Chinese tourists-was caught in a sudden storm around 4 p.m. while returning to Phuket from a day trip to the nearby island of Koh Racha.
All boat passengers were Chinese tourists, officials said.
Thai media showed photos of rescued people in large rubber life rafts at sea, with fishing boats and churning water in the background.
In a separate incident in the same area Thursday evening a yacht called the Senerita carrying 39 people also capsized, the official added.
"Navy divers, frogmen and marine police divers have already been sent to the scene", Rear Admiral Charoenphon Khumrasee, deputy commander for Thai Navy in the southern region told reporters.
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