Egyptian jets bombed Islamic State targets in Libya on Monday, a day after the group there released a video showing the beheading of 21 Egyptian Christians, drawing Cairo directly into the conflict across its border.
Egyptian President Abdel Fattah al-Sisi cut short a visit to Ethiopia for an African Union summit on Friday, following a wave of deadly attacks in the Sinai Peninsula claimed by Islamic State's Egyptian wing.
The sons of deposed Egyptian president Hosni Mubarak were released from prison on Monday, security officials said, a move that could fuel tension after the violent anniversary on Sunday of the 2011 uprising that toppled the autocrat.