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Local media have reported that a pupil was behind the attack and that a teacher and two students were in a serious condition. Aldo Fasci, security spokesman for the northern state of Nuevo Leon, confirmed the student entered the school with a gun and opened fire - shooting the teacher, another student, and pointing the gun at classmates before shooting himself.

REUTERS Three people are dead after a pupil opened fire in a school in Mexico

He said the wounded had vital signs but were in extremely serious condition. Early reports indicate the gunman, thought to be a disgruntled pupil of the American College of Northwest, has been rushed to hospital after being injured in a gun battle with armed cops, who stormed the school following the rampage.

CUBONoticiasMX Emergency crews raced to the scene after reports of the shooting came in.

REUTERS People walk with a student outside the Colegio Americano del Noreste

Mr Fasci 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." He added the motive was still unclear, but attributed it to "the situation that is happening everywhere". He said: "The children have access to the internet. This has happened in other countries."

REUTERS Armed police and military officials rushed to the scene

PH Bullets are found scattered on the floor of the college

In the video, you can see the minor take out the gun, shoot the teacher and then another child. Aldo Fasci, security spokesman

One 15-year-old student was shot in the arm, and two 14-year-olds were shot and injured. There were no details on the nationalities of those shot, and there is yet to be an update on their conditions. Oscar Aboytes, spokesman for emergency services in Nuevo Leon, said all of the wounded were rushed to hospital.

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Early reports suggested three people had died in the fire fight, but no deaths have been confirmed as yet. Television footage showed ambulances and police outside the Colegio Americano del Noreste, south of the industrial city of Monterrey. While unverified images widely distributed on social media showed three people lying on the floor of a classroom with pools of blood around their heads.

TELEMUNDO48 Tens of students gathered at the scene

Shootings at schools are thought to be extremely rare in Mexico. It was unclear how the student got the gun, which is reported to be a .22 caliber pistol, into the school but it is reported he took the gun from home. The pupil had been suffering from depression before what officials have described as "an unprecedented attack" which was caught on video.

REUTERS It was unclear how the student got the gun

NC Three people are dead after a pupil opened fire in a school in Mexico