MAPLE GROVE — A Maple Grove Junior High School teacher has been placed on paid administrative leave after a science experiment burned four students, one of them seriously.

District spokeswoman Barbara Olson says Matthew Achor will remain on leave until the school district’s investigation is complete. She says the district has no timetable for its investigation.

Achor has been with the Osseo School District since 1985, according to state teaching licensing records.

The incident happened in a classroom last Thursday. Three of the four students were treated at HCMC and released that day. A 15-year-old boy who was the most seriously burned left the hospital over the weekend.

A telephone message left at Achor’s home Monday was not immediately returned.