In this image taken from video obtained from the Shaam News Network, which has been authenticated based on its contents and other AP reporting, columns of smoke rise from heavy bombing

 

              In this image taken from video obtained from the Shaam News Network, which has been authenticated based on its contents and other AP reporting, columns of smoke rise from heavy bombing
In this image taken from video obtained from the Shaam News Network, which has been authenticated based on its contents and other AP reporting, columns of smoke rise from heavy bombing by Syrian government forces in Arbeen, Syria, Monday March 18, 2013. Two years after the anti-Assad uprising began, the conflict has become a civil war, with hundreds of rebel group fighting Assad's forces across Syria and millions of people pushed from their homes by the violence. The U.N. says more than 70,000 people have been killed. (AP Photo/Shaam News Network via AP video)