Six people were killed when a passenger boat collided with a vessel hauling stone and capsized on a lake in northern Vietnam, state media said Sunday.The two vessels collided on Thac Ba lake, a popular tourist site in the northern province of Lao Cai, on Saturday evening, with 17 of 23 people on board the passenger boat rescued after it capsized, the state-run Lao Dong newspaper said.For all the latest headlines, follow our Google News channel online or via the app.Six bodies, including those of two children, were recovered by authorities on Sunday, it said.The passenger boat was carrying families visiting relatives for Tet, Vietnam’s Lunar New Year, the paper said.The “tragic incident occurred” on Saturday afternoon while people were on their way home, said Nguyen Hoang Long, Communist Party committee secretary of Cam Nhan commune, according to Lao Dong.The operator of the other vessel involved was not hurt, it said.Authorities were investigating the cause of the incident, state media