Israeli first responders and residents gather on the scene of a rocket strike in the settlement of Har Adar in the occupied West Bank. Israel imposed a total siege on the Gaza Strip Monday and cut off the water supply as it kept bombing targets in the crowded Palestinian enclave in response to the Hamas surprise assault it has likened to the 9/11 attacks. Hamas has called on "resistance fighters" in the occupied West Bank and in Arab and Islamic nations to join its "Operation Al-Aqsa Flood". IMAGES