Damascus explosion

A Syrian man who was injured in a powerful explosion leaves a damaged building in the central district of Marjeh, in Damascus, Syria, April 30, 2013.

People stand on a street lined with a damaged building and destroyed cars after a blast at Marjeh Square in Damascus, April 30, 2013.

Syrian doctors treat citizens who were injured in an explosion in the central district of Marjeh, Damascus, Syria, April 30, 2013.

Syrian security officers, right, speak with shop owners at the scene of a powerful explosion that occurred in the central district of Marjeh, in Damascus, Syria, April 30, 2013.

Syrian firefighters extinguish a burned car at the scene of a powerful explosion which occurred in the central district of Marjeh, Damascus, Syria, April 30, 2013.

People walk on a street near the former Interior Ministry building and destroyed cars after a blast at Marjeh Square in Damascus April 30, 2013.

Security personnel walk in front of the former Interior Ministry building after a blast at Marjeh Square in Damascus, April 30, 2013.

People walk on a street lined with a damaged building and destroyed cars after a blast at Marjeh Square in Damascus, April 30, 2013.