As more civilians are reportedly killed by Syrian security forces, Qatar is calling for the Arab League to urgently meet again over the situation there.
There is widespread concern that Syria has failed to meet its obligations under an Arab League peace plan struck four days ago.
Damascus has been cracking down on anti-government demonstrators with deadly force for months, sparking international condemnation.
The protesters say they are determined to continue their rallies until President Bashar al-Assad steps down.
Activist groups say that, despite the efforts of other Arab countries to end the violence, Syrian forces have killed a further four people over the weekend. Protesters have also been arrested.
The Arab League has pleaded with President Assad to put in place measures to protect civilians and do more to promote dialogue with his opponents.
The UN estimates that since the unrest began in March more than 3,000 civilians have been killed.