U.N. Special Envoy Staffan de Mistura has invited Iran, Russia and Turkey for talks about Syria's Constitutional Committee.  

IranPress/Europe : U.N. Special Envoy Staffan de Mistura has invited Iran, Russia and Turkey in consulting talks on Syria's constitutional committee, to be held in Geneva on Sept. 11-12, a U.N. spokeswoman said on Friday". 

"The talks on forming a committee to draw up a new constitution for Syria are expected to be followed by parallel U.N. talks involving countries including the United States, but she had no date for those" Reuters reported.

speaking to reporters at UN headquarter in Geneva, Switzerland, the spokesperson said" special envoy De Mistura continues his consultations on the establishment of Syrian lead, Syrian owned and UN facilitated constitutional committee within the frame work of Geneva process and in accordance with security council resolution 2254,2015." 

video by Reuters