Two adults and two students suffered minor injuries in an explosion during a science experiment at an elementary school in Billings.

Schools Superintendent Terry Bouck wrote in an email to the school board that a Rocky Mountain College instructor and two graduate students were showing a group of Sandstone Elementary students the experiment Friday afternoon when a glass container exploded.

No harmful chemicals were involved, but flying glass shards injured two students, the instructor and one of the graduate students.

Sandstone Principal Mark Venner tells The Billings Gazette the instructor and two of the students were taken to a hospital. Details about their injuries have not been released.

Bouck says the instructor and his assistants have conducted the experiment "countless times."

More From Newstalk KGVO 1290 AM & 98.3 FM