British Prime Minister David Cameron (C-L), Jordanian Foreign Minister Nasser Judeh (C-R) and United Nations High Commissioner for Refugees (UNHCR) representative to Jordan Andrew Harper (R) walk in the Zaatari refugee camp in the Jordanian town of Mafraq, near the border with Syria, on November 7, 2012. Cameron vowed to do more to help end the bloody crisis in Syria as he made a surprise visit to the sprawling Zaatari refugee camp following a three-day Middle Eastern tour. AFP PHOTO/STR        (Photo credit should read KHALIL MAZRAAWI/AFP/Getty Images)