A missile explodes in the Syrian city of Qusair.<br/> <br />Just across the border with Lebanon, the community is at the center of fierce fighting between rebels and Syrian government forces backed by Lebanese militant group Hezbollah.<br/> <br />This amateur video, which cannot be independently verified, purports to show the aftermath of heavy artillery and tank fire on Saturday.<br/> <br />The Syrian opposition claims thousands of fighters from Iran and Hezbollah have entered Syrian territory and are directly involved in these attacks and others in Damascus.<br/> <br />On Saturday, Hezbollah's leader confirmed the group planned to support President Bashar al-Assad's military with its own troops.<br/> <br />Another amateur video is said to show rebels from the Baba Amr brigade shooting at Hezbollah fighters in a Qusair suburb.<br/> <br />The rebels are largely surrounded in the 30,000-strong town that has become a strategic battle ground.<br/> <br />Assad is looking to secure a route between the capital and a Mediterra
