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The gunman is said to be a 12-year-old student.

Five people have been "gravely injured" in the attack at at Colegio Americano del Noreste, in Monterrey, Nuevo Leon.

Local media first reported the trio had been killed.

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But the school have not confirmed any deaths.

The shooter has been rushed to hospital in serious condition after he tried to kill himself, reports say.

Emergency services and cops were on the scene.

Terrified parents were gathered outside the school.

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Chaotic TV footage too shocking to show revealed the moment the 12-year-old reportedly open fired at the school.

It is believed the student gunman used a .22 caliber weapon.

Ambulances and police were also seen scrambling to the scene in local media clips.

(Image: NC)

Aldo Fasci, security spokesman for the northern state of Nuevo Leon, said a student open fired at the school in an "unprecedented attack".

He told the local media: "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."

No details about the nationalities of the victims have been released.

Shootings are rare at schools in Mexico.