Palestinian prisoners charged of collaborations with Israel, are seen inside a cell at the Hamas-run Ansar prison in Gaza City on March 12, 2013. A Hamas official said Monday that his movement has announced a campaign against spies and collaborators with Israel that will start in the Gaza Strip Tuesday. (Xinhua/Yasser Qudih)

Palestinian prisoners charged of collaborations with Israel, are seen inside a cell at the Hamas-run Ansar prison in Gaza City on March 12, 2013. A Hamas official said Monday that his movement has announced a campaign against spies and collaborators with Israel that will start in the Gaza Strip Tuesday. (Xinhua/Yasser Qudih)

A Palestinian prisoner charged of collaborations with Israel, is seen inside a cell at the Hamas-run Ansar prison in Gaza City on March 12, 2013. A Hamas official said Monday that his movement has announced a campaign against spies and collaborators with Israel that will start in the Gaza Strip Tuesday. (Xinhua/Yasser Qudih)