The Beit al - Maqdis , one of Egypt 's most violent militant groups , has pledged allegiance to Hamas . It has killed dozens of Egyptian police officers and soldiers in recent years . ABM attacked an army base in North Sinai in October , killing at least 31 Egyptian soldiers .
Ansar Beit al-Maqdis , one of Egypt 's most violent militant groups , has pledged allegiance to ISIS . ABM has killed hundreds of Egyptian police officers and soldiers in recent years . ABM attacked an army camp in North Sinai in October , killing at least 31 Egyptian soldiers .