Syrian refugees are seen at Al Zaatri refugees camp in the Jordanian city of Mafraq, near the border with Syria, April 30, 2013.(Xinhua/Mohammad Abu Ghosh)

Workers build water tanks at Al Zaatri refugees camp in the Jordanian city of Mafraq, near the border with Syria, April 30, 2013.(Xinhua/Mohammad Abu Ghosh)

Syrian refugees are seen at Al Zaatri refugees camp in the Jordanian city of Mafraq, near the border with Syria, April 30, 2013.(Xinhua/Mohammad Abu Ghosh)

Syrian refugees are seen at Al Zaatri refugees camp in the Jordanian city of Mafraq, near the border with Syria, April 30, 2013.(Xinhua/Mohammad Abu Ghosh)