Two siblings and their cousin drowned in a river in the central province of Thua Thien-Hue on Monday, news website VnExpress reported.
At around 10 a.m., five children between 7 and 12 years old went fishing by the Pho Loi River in Phu Vang District.
Two of them were siblings who were visiting their grandparents during their summer break.
When the siblings played with their cousins on the river bank, one of the children reportedly fell into the river.
The other four jumped down in an attempt to rescue the first kid.
After Nguyen Huu Loc, a 42-year-old resident, accidentally went past and saw them, he jumped into the river. But he could only save two girls.
The bodies of the three children were found at around 11 a.m. on Monday.
Statistics from the Department of Child Care and Protection show an average of nine children drown every day in Vietnam. Swimming is not effectively taught in schools and the long summer break of up to three months often sees many drowning deaths among children.