Actress and UN special envoy Angelina Jolie has made a surprise visit to Lebanon to draw attention to the challenges facing thousands of Syrian refugee children.
During a three-day visit, Jolie visited children living in the eastern Bekaa Valley, where many of the poorest Syrian refugees in Lebanon reside, as the United Nations Refugee Agency Special Envoy.
The 3,500 children are those who were orphaned, or separated from their families, as they fled into Lebanon.
They form part of the nearly one-third of all Syrians who have been displaced from their homes since an uprising against president Bashar Assad began in March 2011. About 2.5 million Syrians have become refugees; and another 4.2 million are displaced within Syria, the UN estimates - some one-third of the country's pre-war population.
"Meeting these children was a heart-rending experience," said Jolie in a statement issued via the UN. "They have lost their families and their childhood has been hijacked by war. They are so young, yet they are bearing the burdens of their reality as if they are adults."
The tiny Mediterranean country of Lebanon, which neighbours Syria, has absorbed nearly one million refugees, swelling the country's population by one-fifth.
The concentrated numbers of refugees have overwhelmed Lebanon's infrastructure, raised rents and flooded the public health and education systems throughout the country. The poorest refugees huddle in tents made out of old billboard advertisements on land they rent out from farmers in the Bekaa Valley.
Parents of thousands of Syrian children have pulled them out of schools, because they cannot afford the modest Lebanese school fees, or because they need them to work - often as shoe shiners and car cleaners.
During her visit, Jolie called on the international community to ensure the implementation of a recent UN resolution that called for humanitarian assistance to reach Syrian civilians.
On Saturday, the United Nations Security Council passed a resolution demanding immediate access everywhere in Syria for humanitarian aid. The resolution, which marked a rare instance of unity on the security council, doesn't threaten sanctions but it does express the council's intention to take "further steps" if the resolution isn't implemented.
In the statement, Jolie described the resolution as a long overdue step, but stressed that it must be implemented. She said her meeting was also to thank Lebanon for hosting the refugees.
"The generosity and solidarity shown by Lebanon and Lebanese to its neighbour serves as an example to the world for which we should all be grateful. We all need to help them bear this burden," Jolie said.