Syria has rejected an Arab League call for President Bashar al-Assad to step down.
A government official described the plan as "flagrant interference" in the country's internal affairs.
After meeting at its Cairo headquarters, the league said Assad should give way in favour of a unity government with the opposition.
But tensions within the league itself threaten to undermine its mission. Saudi Arabia has withdrawn its own monitors after accusing Syria of failing to cooperate and breaking promises on peace initiatives.