Palestinian schoolboys walk in front their closed school run by the United Nations Relief and Works Agency (UNRWA) at the al-Hussein Palestinian refugee camp in Amman May 12, 2009. More than 7,000 workers of UNRWA in Jordan took part in a 72-hour strike in response to what they said was their employer's refusal to raise their salaries. REUTERS/Muhammad Hamed (JORDAN EDUCATION SOCIETY)