The insurgency began Process_start after the start Process_start of the Egyptian Crisis , which saw the overthrow Change_of_leadership of longtime Egyptian president Hosni Mubarak in the Egyptian revolution of 2011 .

The total casualty count made Action 14 August the deadliest day in Egypt since the 2011 Egyptian revolution Change_of_leadership , which had toppled Change_of_leadership Morsi 's predecessor Hosni Mubarak .