Queen Rania of Jordan (R) arrives at the QEII centre in central London on February 4, 2016, to attend a donor conference entitled 'Supporting Syria & The Region'. 
World leaders gather in London on Thursday to try to raise $9 billion (8.3 billion euros) for the millions of Syrians hit by the country's civil war and a refugee crisis spanning Europe and the Middle East. 
 / AFP / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)