WASHINGTON - A teen gunman on Monday opened fire at the cafeteria of Chardon High School in Chardon, Ohio, US, killing one student while injuring four others.

The shooter, identified by local paper Cleveland Plain Dealer as student TJ Lane, allegedly brought a .22-caliber handgun into the school cafeteria, and started shooting just after 7:30 am. He hit five students at three locations on school campus, about 30 miles east of Cleveland.

Students comfort each other as they leave the scene of a shooting at Chardon High School in Chardon, Ohio February 27, 2012. [Photo/Agencies]

As the shooting unfolded, a brave teacher chased the shooter out of the school with about 1,100 students, and the police, who responded to the scene, locked down the campus while students barricaded themselves inside classrooms.

The authorities used K-9 units to track down the gunman, who was found about a half mile from the school, not far from his car. He had the gun and a knife with him at the time of the arrest.

In a statement, US Secretary of Education Arne Duncan praised the brave teacher by saying "if it were not for the extraordinary courage of a teacher who chased the shooter out of the school, and if not for the speedy reaction of school leaders, the toll of these shootings could have been even worse."

The statement called the shooting "an unspeakable tragedy," but said it's still "too early to know yet why a student took a firearm to school and shot his classmates."

Chardon Police Chief Tim McKenna said that the police is still investigating the shooting. He said that the investigation is likely going to be very long, as authorities have to conduct hundreds of interviews and listen to hours of 911 calls regarding the shooting.

While authorities declined to speculate the motive behind the attack, local media quoted Lane's classmates describing him as an "outcast" who has apparently been bullied. He also tweeted he would bring a gun to school, but nobody took him seriously. There were also reports saying he targeted a specific table at the cafeteria.