Boy, 12, 'guns down teacher and 2 classmates' in school shooting spree

A TEENAGER has shot a teacher and two pupils dead in a crazed rampage, it has been reported.

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

Emergency services and cops are on the scene.

The gunman struck at American College of Northeast, in Monterrey , Nuevo Leon.

Parents are concentrated outside the American College of Northeast after the attack shot