The moment a teen gunman opened fire on his class

A teenage student suffering from depression opened fire at a private American school in northern Mexico on Wednesday (Jan 18), injuring three students and a teacher then shooting himself in what state officials called an unprecedented attack that was caught on security video.

Fasci said the wounded all had vital signs but were in extremely serious condition.

Mexico had been largely spared the phenomenon of school shootings that has hit the United States.

If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. The video shows the suspect saying something to the other students who then fled the classroom.

Guevara was a student at the bilingual Colegio Americano del Noreste, in Monterray, where the attack took place, although his identity has not been confirmed by the authorities as yet. "We have no motive yet".

Most of the injured were shot in the head, including the 24-year-old teacher, a girl and two boys, and the shooter, who are all 15 years old.

Security footage from the school showed the teenager firing shots at students who were seated, as well as a female teacher. A previous police programme had seen students' bags checked at the building's entrances.

Fasci said the teen brought the gun to school from home, but it's unclear how he snuck the.22-caliber pistol into the building. "I think we're going to have to do it again".

In 2014, 43 students from a teacher training college in southern Mexico went missing and are believed dead.

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