Fifteen-year-old Mohamed al-Azi recalls how he was shot in the back by Israeli troops in Beitunia, West Bank. A human rights agency says video of two other boys, Nadeem Nawara and Mohammad Salameh, being shot and killed on the same day shows they posed no threat. Witness Fahker Zayed, as well as corroborating footage from CNN, says the victims were too far away from the soldiers to be considered dangerous