At least five people have been injured after a teenager with depression opened fire at an American school in Northern Mexico.A 24-year-old teacher and four pupils, aged 14 and 15, are among the injured, including the 15-year-old gunman.CCTV footage shows the boy sitting at a desk before he aims his gun at another boy, shooting him in the head from just a few feet away.
He then shoots at the teacher twice as he stands up before wandering around the classroom at the Colegio Americano del Noreste, firing randomly for a few seconds.
Everyone else in the classroom dives for cover under tables while the 15-year-old points the gun at his own head. Eventually he returns to his desk to reload before shooting himself in the head, giving other pupils the opportunity to flea. Local media had earlier reported three people were killed.