At app. 6:30am on Saturday 22 May 2010, Israeli occupation forces (IOF), positioned at the northern separation fence, opened fire on Palestinian workers who were 200 meters away from the separation fence. As a result, Khalid Mohammed Hasan Abu Warda, 22, was shot in the right leg. According to medical sources at Kamal Odwan Hospital, his injuries are described as moderate. These workers were collecting and removing rubble from destroyed buildings in the vicinity of Erez crossing, in the North Gaza District. The IOF has opened almost daily sporadic fire on Palestinian workers who collect rubble to sell to brick factories, which recycles it into bricks. This is the only source of bricks for construction that is available in the Gaza Strip, which suffers from an acute shortage of construction materials due the Israeli siege.