A school safety drill held Tuesday in Shchyolkovo, Moscow Region, turned into an accident when a sound grenade exploded. Four people were injured in the incident.
Regional health authorities said that three of the injured were briefly hospitalized. No official information was released on whether the injured were students or teachers.
Use of sound grenade under investigation
Regional prosecutors are investigating the incident in Shchyolkovo, northeast of Moscow. The investigation is examining why and how a real sound grenade was used during the drill.
According to information from local health authorities, there are unverified claims that all four injured people were teachers.
Accident also occurred at police academy in Komi
In January, one person was killed and dozens were injured in a sound grenade accident at a police academy in the Komi Republic.