BEIJING (AP) – China’s official news agency says a 12-year-old boy is the prime suspect in the fatal poisoning of two sisters, in another tragedy that raises concerns over the well-being of rural Chinese children.

Xinhua News Agency says the boy told police that the girls, aged 8 and 14, drank cola that he had laced with poison in the central province of Hunan.

Xinhua says the girls died Wednesday. It said Saturday that the suspect was familiar with the victims, but did not identify him.

On Tuesday, a 13-year-old boy and his three younger sisters died after they drank pesticide in a village in the southwestern province of Guizhou, according to state media reports and local government statements.