Syrian opposition activists have angrily rejected calls by Kofi Annan, the UN and Arab League envoy to Syria, for dialogue with the government.
The leader of the main opposition, Burhan Ghalioun, said the comments were "disappointing" when Syrians were being "massacred every day".
Annan, who is due in Syria on Saturday, had said a solution lies in a "political settlement".
He also said further militarisation "would make things worse".
Meanwhile, UN humanitarian chief Valerie Amos said the Syrian government had agreed to a "limited assessment" of the situation in the country.
The BBC's Jim Muir is following events in Syria from neighboring Lebanon.