A student opened fire at a high school in Centennial, Colorado, critically injuring a classmate before apparently taking his own life. The school is located down the road from the Aurora movie theater where a gunman went on a shooting spree in 2012.

The victim of Friday’s shooting is a 15-year-old girl, who remains in hospital after surgery. Another female student was thought to be injured as well, but was actually spattered with the victim’s blood.

The shooting was reportedly triggered by a grudge towards a member of staff over a demotion in a debate team.

The Denver Post reported that a shooting had occurred at Arapahoe High School around 1:00 p.m. local time. One hour later, it was announced during a press briefing on the scene that the suspect had been found dead inside the school, apparently from a self-inflicted gunshot wound.

Authorities reported evidence of two Molotov cocktail at the scene. Arapahoe County Sheriff Grayson Robinson told reporters that investigators were working on examining the device, and had found remnants of the two devices, one of which was apparently detonated. They believe that the gunman came armed with a shotgun.

Students heard multiple shots coming from the cafeteria around lunchtime, Post reporter Ryan Parker tweeted from outside the school, just moments after the incident unfolded.

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