The UN Special Envoy for Syria Geir Pedersen said on Friday that the sixth round of the Syrian Constitutional Committee had been a "big disappointment".
He said the talks did not find a common way to draft a new constitution or agree on a date for the next round.
The drafting committee, comprising 45 representatives of Syria's government, opposition and civil society, has a mandate to draw up a new Charter leading to UN-supervised elections.
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