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A view shows the site of an explosion at central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. The big explosion shook the central Damascus district of Mazraa on Thursday, residents said, and Syrian state media blamed what it said was a suicide bombing on "terrorists" battling President Bashar al-Assad. Syrian television broadcast footage of at least four bodies strewn along a main street and firefighters dousing the charred remains of dozens of burning vehicles. Black smoke billowed into the sky. REUTERS/Sana

Vehicles burn after an explosion at central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. The big explosion shook the central Damascus district of Mazraa on Thursday, residents said, and Syrian state media blamed what it said was a suicide bombing on "terrorists" battling President Bashar al-Assad. Syrian television broadcast footage of at least four bodies strewn along a main street and firefighters dousing the charred remains of dozens of burning vehicles. Black smoke billowed into the sky. REUTERS/Sana

This photo released by the Syrian official news agency SANA, shows Syrian security agents carrying a body following a huge explosion that shook central Damascus, Syria, Thursday, Feb. 21, 2013. A car bomb shook central Damascus on Thursday, exploding near the headquarters of the ruling Baath party and the Russian Embassy, eyewitnesses and opposition activists said. (AP Photo/SANA)

This citizen journalism image provided by Aleppo Media Center AMC which has been authenticated based on its contents and other AP reporting, shows an unexploded rocket from a Syrian warplane, in the neighborhood of Karam Alqasir, near Aleppo International Airport, in Aleppo, Syria, Thursday, Feb. 21, 2013. A car bomb near the Damascus headquarters of Syria's ruling party killed scores on Thursday, while a government airstrike on a rebel field hospital in southern Daraa left several dead, opposition activists and state media reported. (AP Photo/Aleppo Media Center AMC)

This photo released by the Syrian official news agency SANA shows an injured Syrian man lying on the ground after a huge explosion that shook central Damascus, Syria, Thursday, Feb. 21, 2013. A car bomb shook central Damascus on Thursday, exploding near the headquarters of the ruling Baath party and the Russian Embassy, eyewitnesses and opposition activists said. (AP Photo/SANA)

Vehicles burn after an explosion at central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. The big explosion shook the central Damascus district of Mazraa on Thursday, residents said, and Syrian state media blamed what it said was a suicide bombing on "terrorists" battling President Bashar al-Assad. Syrian television broadcast footage of at least four bodies strewn along a main street and firefighters dousing the charred remains of dozens of burning vehicles. Black smoke billowed into the sky. REUTERS/Sana

People walk near damaged cars after an explosion at central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. The big explosion shook the central Damascus district of Mazraa on Thursday, residents said, and Syrian state media blamed what it said was a suicide bombing on "terrorists" battling President Bashar al-Assad. Syrian television broadcast footage of at least four bodies strewn along a main street and firefighters dousing the charred remains of dozens of burning vehicles. Black smoke billowed into the sky. REUTERS/Sana

Vehicles burn after an explosion at central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. The big explosion shook the central Damascus district of Mazraa on Thursday, residents said, and Syrian state media blamed what it said was a suicide bombing on "terrorists" battling President Bashar al-Assad. Syrian television broadcast footage of at least four bodies strewn along a main street and firefighters dousing the charred remains of dozens of burning vehicles. Black smoke billowed into the sky. REUTERS/Sana

People walk near debris and damaged vehicles after an explosion at central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. The big explosion shook the central Damascus district of Mazraa on Thursday, residents said, and Syrian state media blamed what it said was a suicide bombing on "terrorists" battling President Bashar al-Assad. Syrian television broadcast footage of at least four bodies strewn along a main street and firefighters dousing the charred remains of dozens of burning vehicles. Black smoke billowed into the sky. REUTERS/Sana

A general view of the destruction after an explosion in central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. A car bomb killed 53 people and wounded 200 in central Damascus on Thursday when it blew up on a busy highway close to ruling Baath Party offices and the Russian Embassy, Syrian television said. REUTERS/Sana

Damaged vehicles and the Russian embassy building (rear C) are seen after an explosion in central Damascus February 21, 2013, in this handout photograph released by Syria's national news agency SANA. A car bomb killed 53 people and wounded 200 in central Damascus on Thursday when it blew up on a busy highway close to ruling Baath Party offices and the Russian Embassy, Syrian television said. REUTERS/Sana

This photo released by the Syrian official news agency SANA, shows Syrian fire fighters extinguishing burning cars after huge explosion that shook central Damascus, Syria, Thursday, Feb. 21, 2013. A car bomb shook central Damascus on Thursday, exploding near the headquarters of the ruling Baath party and the Russian Embassy, eyewitnesses and opposition activists said. (AP Photo/SANA)

This photo released by the Syrian official news agency SANA, shows a Syrian fire fighter extinguishing burning cars after a huge explosion that shook central Damascus, Syria, Thursday, Feb. 21, 2013. A car bomb shook central Damascus on Thursday, exploding near the headquarters of the ruling Baath party and the Russian Embassy, eyewitnesses and opposition activists said. (AP Photo/SANA)

This photo released by the Syrian official news agency SANA, shows flames and smoke rising from burned cars after a huge explosion that shook central Damascus, Syria, Thursday, Feb. 21, 2013. A car bomb shook central Damascus on Thursday, exploding near the headquarters of the ruling Baath party and the Russian Embassy, eyewitnesses and opposition activists said. (AP Photo/SANA)