An Israeli-backed American organization running a new aid program in Gaza is denying a report by The Associated Press that American contractors guarding the foundation’s aid sites inside Gaza were using live ammunition and stun grenades as hungry Palestinians scrambled for food. AP’s story, released Wednesday, is based on accounts from two U.S. contractors who spoke anonymously because they were revealing internal operations of their employer, the Gaza Humanitarian Foundation. They said they were coming forward because they were disturbed by what they considered irresponsible and dangerous practices. It draws also on text messages, internal reports and videos filmed by one of the contractors. The GHF said it launched an “immediate investigation."