Islamist militants attack Egypt security headquarters in Sinai ISMAILIA, Egypt (Reuters) - Islamist militants attacked the Egyptian government security headquarters in Northern Sinai on Sunday with a barrage of mortar bombs and machineguns, wounding three conscripts, security officials said. The militants had climbed onto the roofs of buildings across from the headquarters building and fired rocket-propelled grenades, one security source said. Machinegun battles were still being fought around the building. Reporting by Yusri Mohamed; Writing by Patrick Werr; Editing by Louise Ireland