Having played with brightness / contrast of the published photos to give a better view of the engine, to me it appears to be an uncontained failure affecting practically the entire engine core starting with the LPC. The fan blades all appear intact as far as one can tell so FOD unlikely.
I have an unverified figure of 4.6kg/sec as maximum fuel flow for a GE90, if a piece of shrapnel cuts the fuel line downstream from the HP fuel pump that will create a sizeable pool of fuel in the few seconds in the 8-10 seconds it took to respond to the situation and pull the cutoff lever. As observed by others, the fire appeared to be mainly from fuel coming from the engine and pooling under the wing root.
Last edited by andrasz; 10th Sep 2015 at 04:19.