Four Egyptian policemen were wounded in a gunbattle on Friday with Bedouin in Sinai believed to be sheltering key suspects in the bombing of three Red Sea resorts last year, security sources said. Security forces have since Wednesday besieged about 100 armed Bedouin in the Ras Sudr area of central Sinai, 150 km (94 miles) east of Cairo, and the shooting intensified late on Thursday, the sources said. One policeman was wounded by a bullet in the back and three others were injured when the Bedouin opened fire on their police car, causing it to overturn, they added. The sources said they believed the Bedouin were sheltering two fugitive bombers, Mohamed Ahmed Saleh Fulayfel and Hammad Gumaa, and three others wanted for questioning over the blasts four months ago. Police say the Bedouin were armed with automatic weapons, rocket-propelled grenades and mortars. A gunbattle between the Bedouin and police in the same area on Tuesday wounded one policeman and killed another suspect, the Interior Ministry said on Tuesday. Two other suspected bombers were killed in the Taba attack when their bomb went off early. Egypt has said they were not part of a wider militant network or linked to al Qaeda.