Terribly tragic but fortunate that more weren't killed. I don't mean to devalue the lives lost but it could have been worse. I'm not sure what word best describes such situation.
Catastrophic engine failure with mayday called by the sounds of it. What causes the engine failure though? Was it a mechanical issue? Pilot error? Weather? Bird strike? Contaminated fuel? Runway contamination & engine ingestion? Some more likely than others but no doubt the ATSB will thoroughly investigate. Terrorism or sabotage would seem extremely unlikely.
Would this aircraft be fitted with a black box for ATSB analysis?
A sad day for the families of those killed and in the history of Australian aviation.
My condolences to all affected.