(Graphic) New Chilling Surveillance Footage Of The Shooting Inside Brazil School

Shocking new footage has revealed the moment a teenage gunman opened fire on students during a deadly massacre at a school in southern Brazil.



Five students and two staffers were killed in the horrific attack carried out by former students Guilherme Taucci Monteiro, 17, and Henrique de Castro, 25, at Raul Brasil State School on Wednesday.



Surveillance footage showed Monteiro entering the Sao Paulo school and shooting several people in the head with a .38 caliber handgun as they tried to run away.



De Castro followed, first striking wounded people with an axe and then swinging it wildly while scores of students ran past him.



De Castro then armed his crossbow and walked further into the K-12 school.



The assailants were also carrying Molotov cocktails, knives and small axes, authorities said.



Nine people were injured in the attack, including seven who remain in hospital.



Minutes before the school rampage, Monteiro posted 26 photos on his Facebook page, including several with a gun and one that showed him giving the middle finger as he looked into the camera.



And earlier that day, the assailants shot and killed Monteiro's uncle, who owned a used-car dealership nearby.



Monteiro had worked at the dealership, but had been fired by his uncle for petty crimes.