Vehicles burn after an explosion in central Damascus February 21, 2013. Syrian state media blamed what it said was a suicide bombing on "terrorists" battling President Bashar al-Assad.
People walk near debris and damaged vehicles after an explosion in central Damascus February 21, 2013. Residents said that the big explosion shook the central Damascus district of al-Mazraa.
A Free Syrian Army member carries a weapon while walking down a debris-filled street in Aleppo's district of Salaheddine, February 19, 2013.
Civilians run to take cover after a jet missile hit the al-Myassar neighborhood of Aleppo, February 20, 2013.