According to UN diplomat Carla del Ponte, however, it appears that the recent chemical weapons attack, in April, was carried out by the Syrian rebels and not the regime, as it had been widely assumed. Speaking to a Swiss television channel, del Ponte said that there were “strong, concrete suspicions but not yet incontrovertible proof,” that rebels had carried out the attack. She also said UN investigators had seen no evidence of the Syrian army using chemical weapons, but that further investigation was needed.http://guardianlv.com/2013/08/syrian-chemical-weapons-attack-carried-out-by-rebels-says-un/