"We were hoping that we'd be in a position to announce a date today, unfortunately we're not," UN-Arab League peace envoy Lakhdar Brahimi told reporters in Geneva yesterday.
"But we're still hoping that we'll be able to have the conference before the end of the year," he said, adding he would meet again with Russian and US officials on November 25.
His comments followed a day of intense discussions with senior diplomats in Geneva aimed at preparing a new international conference to try to end the Syrian conflict.
But yesterday's meeting ended without a date.
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Pressed to reveal the main stumbling blocks, Brahimi cited divisions within the Syrian opposition, saying he hoped they would "move towards the formation of a credible delegation" for peace talks.
"That will be a big step forward to make the conference possible," the Algerian veteran international mediator said.
The main umbrella opposition National Coalition has said it plans to meet in Istanbul on Saturday to decide whether to attend the peace talks.
A senior US official voiced optimism that the conference, dubbed Geneva II, could be held by the end of the year, but stressed the importance of giving the splintered opposition time to create a representative delegation.
"This is about building the future of Syria. That is a long, difficult, complicated process. If it takes the opposition coalition a few more weeks to prepare themselves in the way they feel they need to .. We want to support them to do that," the official said, requesting anonymity.
Brahimi also pointed to splits over a potential role for Iran, a staunch ally of Syrian President Bashar al-Assad, in the peace conference.