Montgomery County police responded to a report of a stabbing at Churchill High School in Potomac, Md., early Monday afternoon, authorities said.

Police spokeswoman Lucille Baur said three male students were involved in the incident, which occurred during the school’s open lunch period after a dispute between two 17-year-olds and a 15-year-old turned physical.

The 15-year-old allegedly stabbed the older students with scissors and an art tool, Baur said. There were minor injuries to all three students after the altercation, which happened inside the school building but not in the cafeteria, she said. Students have access to classrooms and other areas during open lunch.

In a message to school families, principal Joan Benz said no one was hospitalized, and the students involved were released to their parents.

Police said the investigation is continuing, and charges have not been filed. The call to report the stabbing at the high-performing school came shortly after 12 p.m. Monday, police said.