In this Tuesday, Jan. 15, 2013 photo, Palestinian children who fled their houses in the Yarmouk camp for Palestinian refugees in south Damascus, sitting inside a children library, at the Ein el-Hilweh refugee camp, in the southern port city of Sidon, Lebanon. The Palestinian exodus from Syria has also revived decades-old debate over the Palestine refugees' 'right of return' to their homes that are now in Israel, adding to the complexity the conflict whose sectarian and ethnic overtones have spilled over into neighboring countries raising fears of a regional war. (AP Photo/Mohammed Zaatari)

Associated Press
In this Tuesday, Jan. 15, 2013 photo, Palestinian children who fled their houses in the Yarmouk camp for Palestinian refugees in south Damascus, sitting inside a children library, at the Ein el-Hilweh refugee camp, in the southern port city of Sidon, Lebanon. The Palestinian exodus from Syria has also revived decades-old debate over the Palestine refugees' 'right of return' to their homes that are now in Israel, adding to the complexity the conflict whose sectarian and ethnic overtones have spilled over into neighboring countries raising fears of a regional war. (AP Photo/Mohammed Zaatari)
In this Tuesday, Jan. 15, 2013 photo, Palestinian children who fled their houses in the Yarmouk camp for Palestinian refugees in south Damascus, sitting inside a children library, at the Ein el-Hilweh refugee camp, in the southern port city of Sidon, Lebanon. The Palestinian exodus from Syria has also revived decades-old debate over the Palestine refugees' 'right of return' to their homes that are now in Israel, adding to the complexity the conflict whose sectarian and ethnic overtones have spilled over into neighboring countries raising fears of a regional war. (AP Photo/Mohammed Zaatari)
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