"24 people were injured, 19 of them were hospitalized. Among the victims are pupils from the second to the tenth grade and one teacher," the source said.
According to him, the condition of the hospitalized is assessed as satisfactory.
At the same time, three schoolchildren are in intensive care due to the need to provide oxygen.
The incident happened at school # 36.
According to the regional Ministry of Education and Science, a group of high school students sprayed "an unknown gas substance" in the corridor.
Initially, it was reported about 16 poisoned.
Lessons at the educational institution have been canceled, a general cleaning with disinfection is being carried out.