Videos from the poor neighborhood of Hajar al-Aswad in south Damascus showed what activists said were people killed by regime shelling. One video showed a dead family of five, all wrapped in blankets. Others showed three dead bodies in a small bus and the bodies of two young children laid out on a floor.
Activist videos could not be independently verified due to reporting restrictions in Syria, but they appeared genuine and corresponded to other AP reporting on the events depicted.
Also Monday, a car bomb exploded in the Damascus suburb of Jarmana, knocking balconies off of residential buildings and sending firemen rushing to fight the blaze, according to TV footage. The state news agency SANA said 11 people were killed and 67 wounded. The Observatory said five people were killed.
SANA also reported a second car bomb in the area later Monday but did not give a number of the dead and wounded.
In Turkey, about 150 members of the Syrian opposition met Monday to discuss how to manage rebel-held areas and plan for a post-Assad future.
Abdelbaset Sieda, president of the Syrian National Council, said the Syrian regime was losing its grip on power and that the opposition must be prepared to rebuild the devastated country.
Since the start of the uprising, the Syrian opposition has failed to come up with a united leadership and has been riddled by disagreements between numerous factions over the role of Islam in the uprising, the best way to topple Assad and other issues.
Exile opposition leaders also have no control over and limited communication with many rebel brigades fighting inside the country.
Associated Press writers Bassem Mroue in Beirut, Christopher Torchia in Istanbul contributed reporting.