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A 12-year-old pupil has stormed an American college in Mexico and blasted a student and a teacher, it has been reported.

The young attacker is thought to be a disgruntled pupil of the American College of Northwest in Monterrey.

According to El Pais newspaper, the 12-year-old boy was at the entrance to the school at around 8am this morning.

Early reports indicate he waited until he got into his class, where he pulled out a gun and blasted one pupil and the teacher.

The gunman then threatened the rest of the class before turning the gun on himself in the middle of the room.

Aldo Fasci, security spokesman for the northern state of Nuevo Leon, said: "In the video, you can see the minor take out the gun, shoot the teacher and then another child.

"He is there for a while, pointing at other students, and a few minutes later he opens fire. We have no motive yet."

Emergency crews raced to the scene after reports of the shooting came in and heavily-armed cops swarmed the school.

Television footage showed ambulances and police outside the Colegio Americano del Noreste, south of the industrial city of Monterrey.

There were no details on the nationalities of those shot.