The perpetrator of a shooting at a US high school was a 14-year-old student and two of the four people killed were fellow pupils, authorities say during a press briefing. "Of those that are deceased, two were students and two were teachers here at the school," says Chris Hosey, director of the Georgia Bureau of Investigation. "The shooter is in custody... He is a 14-year-old-student here at the high school." SOUNDBITES