Authorities in that area apparently haven't learned anything after the MetroJet 9268 incident (that's the aircraft that was brought down by terrorists in October after take-off from Sharm el-Sheikh).
Another incident has occurred this morning with an EgyptAir flight hijacked by an Egyptian national claiming to be wearing a suicide vest. This was a flight from Saudi Arabia to Cairo, via Alexandria. The security screeners must have been "asleep at the switch" when they processed that guy!
The plane is currently on the ground in Larnaca (Cyprus), and 30-40 passengers have been released. There are still a few hostages on board (flight crew and foreign nationals - Egyptian nationals have been released). According to current reports, there were eight Britons and ten Americans on board).
The hijacker reportedly has an ex-wife in Cyrpus, so that may have been a factor in his choice of airports. Hopefully this will be resolved soon, and won't be repeated.