From a story on the DW (Deutsche Welle) website this AM:
"
Smoke and fire broke out on board EgyptAir flight MS804 minutes before the plane plunged off radar screens during the early hours of Thursday morning.
"There was a fire on board," aviation expert Tim van Beveren told DW. "The system sent very clear messages. There was lavatory smoke detected. A minute later, avionics compartment smoke detected...Two minutes later, the flight control units are failing.""
Fatal EgyptAir flight suffered on-board fire minutes before crash | News | DW.COM | 20.05.2016