Police in the northern city of Hai Phong are investigating two men suspected of enticing primary school students to use methamphetamine.
On Thursday afternoon, some residents living near Du Hang Primary School caught the duo while they were trying to talk some students into using the illicit drug.
The residents then took the men to a police station.
Nguyen Thi Mai Anh, the principal of the school, confirmed with the police that the parents of three students reported that their children were persuaded to use methamphetamine by some strangers.
The parents had been worrying and they brought and picked up their children after school by themselves every day.