thank you very much for coming in william atwell from the frontier strategy group >>> moving from africao u.s., where 17 people have been killed after a gunman opened fire with an assault rifle at a high school in florida. more than a dozen others have been wounded in the town of boca raton. the 19-year-old alleged shooter was later arrested that is the second deadliest act of gun violence at a public school violence in u.s. history and the 18th such school attack this year. this report contains cell phone video from the scene that could be disturbing. >> i heard three, four shots, pops then the alarms rang >> i thought it was a drill. >> reporter: but this was no drill. the unimaginable right before their teenage eyes during the school day >> it was another body in front of me. there was three at the bathroom door, and another one. >> reporter: within minutes law enforcement swarmed the huge south florida high school campus to fine the shooter. the suspect, 19-year-old nicolas cruz, a former student who had been expelled for disciplinary reasons. >> he's just always been a crazy kid. i