In this citizen journalism image from Aug. 1, 2012, Syrians chant slogans during a demonstration in Damascus, Syria. Syrian opposition activists say regime forces have swept through neighborhoods south of the capital Damascus in a deadly military operation that has inflicted casualties. (Associated Press/Shaam News Network)
This image made from amateur video released by the Ugarit News and accessed July 31, 2012, purports to show black smoke rising from buildings in Aleppo, Syria. (Associated Press/Ugarit News via AP video)
This image made from amateur video released by the Ugarit News and accessed July 30, 2012, purports to show Free Syrian Army soldiers in Anadan 16 kilometers (10 miles) from Aleppo, Syria. (Associated Press/Ugarit News via AP video)
This image made from amateur video released by the Shaam News Network and accessed July 29, 2012, shows a Syrian military tank in Daraa, Syria. (Associated Press/Shaam News Network via AP video)
Armed Syrian rebels stand guard July 25, 2012, as refugees flee Syria at the border crossing by the Iraqi town of Qaim, 200 miles (320 kilometers) west of Baghdad. (Associated Press)