A boat with nearly 30 tourists on board sank after another boat crashed into it in Vietnam's most famous tourist destination, Ha Long Bay, on Sunday, but no casualties were reported.
The accident happened at around 3 p.m. when the boat, belonging to the Hai Long Company, was anchored some 300 meters from the Ti Top Island.
Witnesses said a boat carrying water then crashed into it and the boat with tourists soon began to sink.
The victims were saved by people on other tourist boats anchored nearby.
According to Tuoi Tre, 28 French tourists, a tour guide and 12 Vietnamese crew members were on board when the accident took place.
It quoted Dang Huy Hau, vice chairman of Quang Ninh Province's People's Committee, as saying that local agencies will salvage the boat to identify the cause.
An investigation has been launched into the accident.
In February, ten foreign and two Vietnamese tourists died when a boat sank in the bay that is in the running for being voted one of the seven new natural wonders of the world.
The accident was later identified as having been caused by human error - the valve that allows water to come into the boat to cool the engine wasn't closed properly before the crew went to bed.
The tragedy prompted local authorities to launch inspections into boats operating in the bay. The operations of the company that organized the tour and the one that owned the boat were both suspended.