[CivilWarBrewing]

If I had to wager on this one, I would bet that two of the cockpit windows were blown out because of a bomb, hence the alerts before the aircraft went down. The cabin briefly filled with smoke BUT MOSTLY FOG due to rapid depressurization and visibility for the surviving pilot was next to ZERO.

Lack of claim of responsibility could be due to this being a 'lone wolf' bomb maker* OR there's more aircraft take-downs afoot. *

SUICIDE BOMBER IN THE BATHROOM?

[r_barton]

In Feb 2016, a laptop bomb was smuggled aboard an Airbus A320 in Somalia. A passenger set it off, blowing a hole in the side of the plane that sucked them out. Despite the damage, the plane managed to land.

http://www.cnn.com/2016/02/02/africa/somalia-airplane-explosion/

The Egyptian A320 was in Eritrea (near Somalia) the morning of the crash. Maybe the pilot picked up a laptop bomb and carried it aboard. They don’t check pilots that thoroughly.

Sensors on the Egyptian A320 showed smoke and things failing in the cockpit and nearby restroom. A suicidal pilot could have brought a bomb on board.