There has been fresh bloodshed in Syria according to opposition activists.
At least two people were killed, they say, and more than a dozen wounded after tanks swept into a city where protesters had denounced President Assad.
The gunfire came hours after the rally in Latakia on the coast. Fearing reprisals, many fled, say human rights campaigners, who have reported another death near the Lebanese border.
Authorities have barred most independent media, making it difficult to verify events on the ground.
After five months, demonstrations continue across Syria despite a military campaign against protesters.
President Obama spoke to the leaders of Saudi Arabia and Britain this weekend. The White House said all three called for an immediate end to the crackdown.
Syrian forces kill three, tanks move into city say activists