"British nationals should leave now by commercial means whilst these are still operating," the Foreign Office said in updated travel advice.
"Those who choose to remain in Syria, or to visit against our advice, should be aware that it is highly unlikely that the British embassy in Damascus would be able to provide a normal consular service in the event of a further breakdown in law and order and increased violent civil disorder.
"Evacuation options would be limited because of likely communication and travel restrictions," it said.
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