Following the incident in which 500 Syrian soldiers and 50 vehicles crossed into the demilitarized zone near the border with Israel in the Golan Heights last week, Israel filed a formal complaint to the UN secretary general and to the president of the UN's Security Council, warning that the event may have serious ramifications.

Open gallery view This image made from Syrian State TV video purports to show Syrian troops fighting against Syrian rebels in the Al-Midan area of Damascus, Syria on Wednesday, July 18, 2012. Credit: AP