Rescue teams found 11 survivors and recovered 27 bodies, eight of them children, the state-run Vietnam News Agency said, citing local authorities. Halong Bay, about 200 km (125 miles) northeast of Hanoi, attracts tens of thousands of visitors every year. Boat tours are hugely popular.

The boat, carrying 48 passengers and five crew members, was on a sightseeing tour of Ha Long Bay when a sudden storm caused it to overturn, state media said. At least 10 people were rescued.

Storm Wipha, the third typhoon to hit the South China Sea this year, is projected to make landfall along Vietnam’s northern coast early next week.