Students ran for cover Friday afternoon after a police officer used pepper spray to break up a large fight near Baldwin High School, Nassau police said.

The officer responded shortly after 1:15 p.m. to a 911 call about a brawl, and when students ignored his commands to stop fighting, he used his pepper spray, said Det. Vincent Garcia, a police spokesman.

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Police did not release other details but said the incident is under investigation.

Baldwin school officials told News 12 Long Island that several students were treated for pepper spray irritation at the high school nurse’s office.

Students told News 12 that that the fracas occurred on “Freshman Friday” and that it was preceded by on-campus pranks, including the release of crickets and stink bombs in the school cafeteria.

The fight reportedly spilled onto the parking lot of a drug store across from the school, prompting the store to call 911.