Seven students were taken to the hospital on Monday after a hazmat exposure on the campus of Bristol-Plymouth Regional Technical School in Taunton, Massachusetts, according to Fire Chief Steven Lavigne.

Officials say 7 students were transported to Morton Hospital for evaluation. The remaining students were released to their parents or guardians. Investigators say they did not detect any unusual readings in the building, and the Taunton Board of Health approved the building’s reopening.

Seven students at a technical high school in Taunton, Massachusetts, were hospitalized Monday due to a pungent odor. NBC affiliate WJAR reports that authorities received a report about the odor at the lab at Bristol-Plymouth Regional Technical School around 1:45 p.