Youtube clip of incident:
EgyptAir Cockpit Fire With 300pax Onboard (by flythere Jul 29 2011 in Civil Aviation)
More images contained within the report, which on p.66 goes on to state:
The cause of the fire could not be conclusively determined. It is not yet known whether the oxygen system breach occurred first, providing a flammable environment or whether the oxygen system breach occurred as a result of the fire.
Accident could be related to the following probable causes:
1. Electrical fault or short circuit resulted in electrical heating of flexible hoses in the flight crew oxygen system. (Electrical Short Circuits; contact between aircraft wiring and oxygen system components may be possible if multiple wire clamps are missing or fractured or if wires are incorrectly installed).
2. Exposure to Electrical Current
Full report here: