"According to preliminary data, 20 children have applied to medical institutions with complaints of poor health," the supervisory agency said in a statement.
The inspection was entrusted to the Klin City Prosecutor's Office.
Based on its results, an assessment of compliance with the requirements of federal legislation will be given and the necessary response measures will be taken.
Earlier it was reported about the death of 34 people as a result of poisoning with surrogate alcohol in the Orenburg region.