A member of the powerful clan in Gaza City that is holding BBC correspondent Alan Johnston was shot to death Wednesday morning. Munir Dughmush was shot while standing outside a building in Gaza City's Zaitoun neighborhood, sources in the Gaza Strip said. They said masked gunmen opened fire at him, killing him instantly. Following the incident, foreign journalists were advised to stay away from the Gaza Strip for fear of reprisal. Hamas militiamen have been surrounding the homes of members of the Dughmush clan in Gaza City's Sabra neighborhood since Saturday, demanding that the clan release Johnston. Hamas has issued an ultimatum to the clan to release the BBC correspondent by next Monday or face a massive attack. One of the leaders of the clan, Mumtaz Dughmush, is said to be negotiating Johnston's release with Hamas. Mahmoud Zahar, a Hamas leader in the Gaza Strip, said his movement was determined to ensure Johnston's safe release.