Syrian tanks enter demilitarized Israeli frontier - Article Photos 2/7

In this Friday, Nov. 02, 2012 photo, Syrian residents run for cover to an underground basement as an attack by Syrian army heavy artillery hits an apartment compound of rebel fighter's families in Aleppo, Syria. U.N. officials and human rights groups believe President Bashar Assad's regime is responsible for the bulk of suspected war crimes in Syria's 19-month-old conflict, which began as a largely peaceful uprising but has transformed into a brutal civil war. However a video that appears to show a unit of Syrian rebels kicking terrified, captured soldiers and then executing them with machine guns raised concerns Friday about rebel brutality at a time when the United States is making its strongest push yet to forge an opposition movement it can work with. (AP Photo/Narciso Contreras)