CHARDON, Ohio — Gunfire at a high school outside Cleveland injured a number of students Monday morning, and at least one suspect has been arrested, officials said.

The shooting was reported about 7:30 a.m. at the 1,100-student Chardon High School about 30 miles east of Cleveland, said Civil Deputy Erin Knife of the Geauga County Sheriff’s Office. She didn’t know the number of victims, but multiple news reports cited four students shot.

Television news footage showed anxious parents escorting children away from a school building, and ambulances could be seen outside.

Superintendent Joseph Bergant II told television station WKYC that the suspect is in custody. He said he didn’t know the extent of the students’ injuries.

A spokeswoman for Cleveland’s MetroHealth System said a medical helicopter was dispatched to the high school. Schools in the area were locked down.

Chardon is a city of about 5,100 residents.