Vice President Joe Biden on Monday was to meet King Abdullah II of Jordan, a key US ally in the Middle East that has seen an influx of refugees from the conflict in neighboring Syria.
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Some 150,000 Syrian refugees have fled to neighboring Jordan since the start of the March 2011 uprising against President Bashar al-Assad.
The uprising and the government's brutal crackdown have increasingly come to resemble a civil war, with 23,000 people killed, according to a Syrian human rights group. The United Nations puts the figure at around 17,000.