"We are investigating 14 alleged cases of chemical weapons or chemical agent use. But we have not established the responsibility or the nature of the materials that were used," Paulo Pinheiro, chairman of the U.N. Commission of Inquiry on Syria told a news conference.
"We don't have to share where, or when, or what moment. We don't have to elaborate more on that."
Pinheiro also said Syria had invited commission member Carla del Ponte to visit Syria in a personal capacity, but the commission wanted an official visit, including him.
Del Ponte said it was assumed she had been invited to Syria because she said publicly in May that the commission had allegations that opposition groups had used chemical weapons...
http://www.reuters.com/article/2013/09/16/us-syria-crisis-pinheiro-chemical-idUSBRE98F0EM20130916