FOUR people who gave balloons to more than 30 primary pupils have been detained by the Krong Ana district police in the Central Highlands province of Dak Lak.
Officers arrested three men and one woman. Two are foreigners and two are Vietnamese.
The district police are working with the provincial Department of Foreign Affairs to conduct further investigations, said a leader of the district police on Friday.
The incident happened at about 1.30pm on Wednesday at Ly Tu Trong Primary School in Buon Trap Town, Krong Ana district.
Four people came to the school and gave balloons to the students.
About half an hour later, 31 pupils began to show signs of dizziness, headache, abdominal pain and nausea.
They were then taken to the school’s medical room and the case was reported to local authorities.
Seventeen of the pupils were admitted to the district medical centre while the rest are being monitored at home.
The pupils said there was a kind of white powder on the balloons.
They started to have the symptoms when they blew the balloons.
The principal of the school said the white powder tested negative for drugs.
All the pupils are now in stable condition. — Vietnam News/ANN
