loath as I am to let facts interfere with a good story, the story so far, after engine start of #4 engine which was slightly longer than normal 43 secs, the captain started #3 engine during this time the lights dimmed and flames were reported from #4 engine jetpipe or similar areas, by 1) the ground guy on the headset, this used to be an engineer but know not 2) a passenger or two. At no time did the flight crew get any warnings on the displays incl the MWS. The crew shut down the cc evacuated the aircraft down the front.
slide, as the rear slide is not being replaced guess it was not activated.
As those who like less sensational reporting the aircraft was not taxying and initial engineering reports reveal no signs of fire or leaks or any reasons for the flames or panic
But lets not get in the way of a good story, I hope the headset guy is congratulated and not criticised for I hope I would have the guts to call fire in a similar situation
