(CNN) -- At least three students were wounded when two people entered the cafeteria of a high school near Cleveland, Ohio, and opened fire just as the school day was beginning, police and a school board member said.

The shooting happened at Chardon High School in Chardon, Ohio, Lt. John Hiscox of the Geauga County Sheriff's Office said.

Three or four students were hit by the gunfire, said Larry Reiter of the Chardon Schools Board of Education. He did not know their conditions, but said helicopters had been called to take the injured to a hospital.

Chardon is a small city of about 5,100 people located 30 miles east of Cleveland. About 1,150 students attend the high school, which is next to Chardon Middle School and across the street from Maple Elementary School.

CNN contributed to this report