Syria's government and main political opposition have traded bitter accusations as a major peace conference begins in Switzerland.
UN Secretary General Ban Ki-moon urged delegates to engage in constructive discussions, but neither side appeared prepared to abandon their positions.
US Secretary of State John Kerry said there was "no way possible" President Bashar al-Assad could remain in power.
The conflict has left more than 100,000 dead and millions displaced.
The summit is discussing the Geneva communique which lays out a political transition plan for Syria. But the key issue is President Assad's future.
http://www.bbc.co.uk/news/world-middle-east-25836827