cairo egyptian security force kill five suspect militants raid monday desert location use group train nile delta province sharqiya north cairo interior ministry say security force arrest six people seize ammunition weapons operation ministry statement say statement link militants specific group since 2013 egyptian security force battle islamic state affiliate mainly desert region north sinai militants kill hundreds police soldier last month egypt saw deadly attack modern history militants kill 300 north sinai mosque group claim responsibility though officials say gunmen brandish islamic state flag egyptian security force kill five suspect militants raid