The Wonder Sea boat was carrying 48 passengers and five crew members — all of them Vietnamese — on a tour of Ha Long Bay, a popular destination, according to the reports.

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.

Rescuers searched desperately Sunday for four people still missing after at least 35 were killed when a boat capsized at one of Vietnam's most popular tourist destinations.Ha Long Bay is one of Vietnam's most popular tourist destinations,