Syrian political and armed opposition groups meeting in Riyadh have agreed on a framework for negotiations with President Bashar al-Assad, opposition sources told AFP on Thursday.

"An agreement has been reached on... a unified vision for the settlement process and a supreme committee that would act as a reference for the negotiating team, the composition of which will be specified later," said Suhair Atassi, a member of the National Coalition, the main opposition grouping.