The Arab League has given Syria three days to "stop the bloody repression" of protesters and allow in teams of observers.
Qatari Foreign Minister Sheikh Hamad Bin Jassim al-Thani said Syria faced sanctions if it did not co-operate.
At a meeting of the Arab League in Morocco, he said diplomatic efforts were "close to the end of the road".
As the meeting took place, angry crowds in Damascus attacked the embassies of Morocco and the United Arab Emirates.
Morocco responded by recalling its ambassador to Syria, AFP news agency reported.
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