SAN JOSE (CBS SF) — Students at a Bay Area high school were sickened following some kind of chemical exposure on campus Wednesday, with six requiring hospitalization.

The incident happened at Oak Grove High School in San Jose just before 3 p.m. Wednesday.

READ MORE: Long Lines Form Outside San Mateo Event Center COVID-19 Vaccination Site

San Jose Fire Department spokesman Capt. Mitch Matlow said a total 12 people experienced symptoms described as burning in their noses and mouths in a classroom at the school.

All were decontaminated and treated at the school, whild six were taken to a hospital.

READ MORE: Late Rally Fizzles, Warriors Fall to Spurs 112-107

A hazardous materials crew in protective gear was in the school trying to determine what the substance was that caused the respiratory distress.

Fire officials urged others who were in the classroom but who have gone home to shower and wash their clothes to call 911 if they feel sick.

MORE NEWS: King Tide Flooding on SF Waterfront Foreshadows Future Climate Change Norm

© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Bay City News Service contributed to this report.