Foreign reporters may be banned from entering Syria but people are continuing to upload video onto social websites.
The latest footage obtained by news agencies claimed to show a demonstration in a suburb of the capital Damascus.
The rally was described as a march of students, doctors and writers but plain clothed police and other uniformed agents moved in and arrested the protesters.
Some were forced into a waiting minivan where detainees were beaten.
Each new video that emerges adds to a picture of violent suppression of protesters who appear to be unarmed and non-aggressive.
That is certainly what the EU thinks. On Tuesday a series of sanctions aimed at forcing an end to the violence were announced. The measures include a travel ban and asset freeze on 13 top officials, although President Bashar al-Assad is not yet on the list.