Three of four students are released from Hennepin County Medical Center after a science experiment gone wrong thursday morning.
Laurel Anderson, principal of Maple Grove Junior High says the four 9th graders were burned in an accident involving a flammable gas and nearby papers that apparently caught on fire.
Two students, who didn't witness the accident, told KARE 11 that they heard the teacher was performing an experiment that involved igniting methane.
The school district did not confirm that report.
The victims' injuries ranged from mild to severe burns, but none were considered life-threatening.
The rest of the students in the classroom were not injured.
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