Ansar Beit al-Maqdis , one of Egypt 's most violent militant groups , has pledged allegiance to ISIS . Comment: A vehicle explodes . ABM attacked an army camp 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 . Comment: ABM attacked an army camp in North Sinai in October , killing at least 31 Egyptian soldiers .