CARLISLE, Pa — Authorities say five students were injured after a small explosion and fire in an eighth-grade science classroom in Carlisle.

Cumberland County spokeswoman Meg Silverstrim said two of the children from Wilson Middle School were taken by helicopter to Johns Hopkins Hospital in Baltimore, while the others were driven to Carlisle Regional Medical Center.

Silverstrim says the cause of the explosion and fire is under investigation. Crews were able to extinguish the fire quickly, and the school continued with its regular day.

She had no information about the children's medical condition.

School district officials have not returned messages seeking information about the incident.