Science class explosion injures 7 students, 1 teacher in Pa.

A small explosion and fire Wednesday in a central Pennsylvania eighth-grade science classroom required hospital treatment for seven students and a teacher.

Carlisle Area School District Superintendent John Friend told reporters that a fireball occurred when some sort of chemicals were mixed together. He said that the teacher put out the fire with an extinguisher, WHTM-TV reported.

Officials at Johns Hopkins said they could not provide information without the patients' names, which were not released.

A Carlisle Regional Medical Center spokeswoman said five students and a teacher were treated for what she described as minor injuries, and all six had been released by midafternoon.

The school continued with its regular day, Silverstrim said.