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.

“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 outlet VnExpress said.

A tourist boat capsized in Vietnam’s Ha Long Bay last year, killing at least 37 people.