Two students were injured after an explosion occurred in a science room of a middle school in Haeundae.
It was around 3:30 pm on Monday when their eyes and faces were hurt.
Two teachers were also taken to the hospital with minor injuries.
The police believe that the accident occurred due to a sodium substance in a glass beaker that produced a chemical reaction while the students were cleaning the science room after class.
Authorities are still investigating the accurate cause of the accident.