Yemeni workers clean up the camp ground where former Yemeni president's supporters set up their tents during a two-year demonstration at Change Square in Sanaa, Yemen, on May 3, 2013. According to Yemen's official Saba news agency, the Yemeni authority ordered Friday to remove tent camps at Change Square.(Xinhua/Mohammed Mohammed)

Yemeni workers clean up the camp ground where former Yemeni president's supporters set up their tents during a two-year demonstration at Change Square in Sanaa, Yemen, on May 3, 2013. According to Yemen's official Saba news agency, the Yemeni authority ordered Friday to remove tent camps at Change Square.(Xinhua/Mohammed Mohammed)