Doctors at a hospital in Aleppo, Syria, treat a boy injured in what the government said was a chemical weapons attack on March 19. Syria's government and rebels accused each other of firing a rocket loaded with chemical agents outside of Aleppo. George Ourfalian/Reuters/Landov hide caption

itoggle caption George Ourfalian/Reuters/Landov

The White House said this week that it believes Syria has been using chemical weapons, but President Obama has not said how the U.S. might respond. Here, rebel fighters in Syria prepare to launch of a rocket in the northern Syrian city of Aleppo, on April 21. The rebels have also accused the Syrian government of employing chemical weapons. Miguel Medina /AFP/Getty Images hide caption

itoggle caption Miguel Medina /AFP/Getty Images

Israeli students snap photos of the Syrian landscape from Mount Bental in the Golan Heights, which is occupied by Israel. Israelis have even watched Syrian troop and rebel movements from here. Emily Harris/NPR hide caption

itoggle caption Emily Harris/NPR

A top Israeli military official on Tuesday accused Syrian President Bashar Assad's regime of using chemical weapons in recent fighting in Syria. Syria has denied using such weapons. Assad is shown here at the Opera House in Damascus in January. Anonymous/SANA/AP hide caption

itoggle caption Anonymous/SANA/AP

A deadly car bomb explosion rocked central Damascus, Syria, in front of the Finance Ministry building (center) and the Central Bank (right) on Monday. Louai Beshara/AFP/Getty Images hide caption

itoggle caption Louai Beshara/AFP/Getty Images

Ahmed, 10, was rocketed on Feb. 13., and lost his leg. There doesn't seem anything more mundane than drawing when you are standing next to a child that has lost his mother, his brother and his leg within the last 48 hours His father, Yassar's face, raked with worry sits in a clinic at Bab al Hawa. He keeps pulling his adult sized oxygen mask off his little face. Courtesy of George Butler hide caption

itoggle caption Courtesy of George Butler