Syrian Refugees Number Over 500,000
Most are in Lebanon, Jordan and Turkey
More than half a million people have now fled the conflict in Syria to neighbouring countries, according to the UN's refugee agency.
The UNHCR says it has accounted for 509,559 refugees so far, primarily in Lebanon, Jordan and Turkey, and that many more are yet to come forward.
More than 2m people are also thought to be internally displaced within Syria.
Meanwhile, a UK-based activist group says rebels led by an Islamist faction have seized an army base near Aleppo.
