Explosions have hit Damascus, the Syrian capital, according to local reports.
There were also "plumes of smoke" seen across different sites in the city, the Syrian Observatory for Human Rights said.
Videos, which the BBC has not verified, showed a large cloud of smoke and buildings destroyed.
It comes amid heightened tensions in the Middle East since the Israel-Gaza war.
There were reports of casualties in the explosion, which is understood to have taken place the Mazzeh neighbourhood, south-west Damascus.
The Mazzeh area is home to a military airport, as well as the UN headquarters in Damascus, embassies and restaurants.
A resident told AFP news agency that they saw "explosions" in the western Mazzeh area and "a large cloud of smoke".
"The sound was similar to a missile explosion, and minutes later I heard the sound of ambulances," he added.
Source: BBC
