A 12-year-old boy is facing charges after a 12-year-old girl was injured by a chemical explosion at Ruth M. Buck Elementary school Wednesday.

The incident happened on the school's playground during morning recess around 10:30 a.m. CST, according to Regina Public Schools spokesman Terry Lazarou.

The 12-year-old boy, who cannot be named due to the Youth Criminal Justice Act, allegedly made an improvised explosive device by mixing chemicals in a closed container, according to a police news release.

"At this point, we have no indication … that the student that did this intended to do any harm to anyone. That student, we believe, was only showing off," Lazarou said. "That doesn't minimize it at all."

Lazerou said school staff took the incident very seriously and proper protocols were implemented in the immediate aftermath.

The girl's injuries were consistent with chemical burns, police said.

There is no update on the girl's condition, Lazarou said. He did not know which chemicals had been mixed together to cause the explosion. Regina police declined to elaborate on the chemical mixture.

"It was a situation that got quickly out of hand," Lazarou said of the incident.

Lazarou said police get involved in school incidents when there is an injury, as per school policy. Classes continued as normal after the incident.

Police said there is no evidence the incident was targeted.

The boy is charged with using explosives, assault with a weapon and mischief under $5,000.

Police searched the boy's home and continue to assess any potential threats in the future.

He was scheduled to appear in court Thursday morning.