On 10 November 2014 , many members of the group Ansar Bait al-Maqdis took an oath of allegiance to al-Baghdadi . Following this , the group assumed the designation Sinai Province ( '' Wilayat Sinai '' ) . They are estimated to have 1,000 – 2,000 fighters . A faction of the Sinai group also operates in the Gaza Strip , calling itself the '' Islamic State in Gaza '' . It claimed responsibility for the downing of Russian Metrojet Flight 9268 , which killed all 224 people on board , although Egyptian officials disputed the claim
Metrojet Flight 9268
Metrojet Flight 9268
Islamic State of Iraq and the Levant