Updated

Syrian state TV and residents say an explosion has shaken a Damascus neighborhood that houses several embassies and a military airport.

The Britain-based Syrian Observatory for Human Rights says a car bomb detonated at a checkpoint near the military airport in the western neighborhood of Mazzeh on Sunday evening.

The Observatory, which has a wide network of activists on the ground in Syria, said there are reports of casualties. The media office of the Free Syrian Army's military council in the Damascus area also said the explosion targeted the military airport in the neighborhood.