A source close to Jabhat Al-Nusra has confirmed to me that three pro-Assad soldiers have been executed in the northern city of Raqqa earlier this week. The source, who called the Assad soldiers "dogs" in his post on Twitter, spread the video through Tumblr and stated that the assassination took place on May 14th, 2013. The online video shows a masked man reading a statement with armed rebels standing in the square. Afterwards the man gives the signal for the execution which leads to a celebration of gunfire by the army. Al-Nusra has been labeled as a "terrorist" organization by the United States and the brutal execution comes at a delicate time as the West considers providing arms to Syrian rebels.
Raqqa was captured by the Al-Nusra Front on March 5th, 2013 while the Free Syrian Army, the secular group of the Syrian rebels, played little to no role in the siege.