-aware starvation: unlikely: atc routine, atc surprised after loss, airport and cabin crew not prepared for emergency.
-unaware fuel starvation: unlikely: engines away from plane as if (some) thrust was available on impact, compressor blades damaged as if they were rotating.
-configuration error: unlikely: flaps and slats seem in proper position on pictures.
-terrorst involvement: unlikely: they would let us know proudly.
-flying error: unlikely maybe attributing: 3 man crew, line training maybe? no distress call, so the situation evolved in seconds. it would be a very gross mistake and is therefor unlikely to be the only cause, maybe attributing,
-icing on flight surfaces: unlikely, maybe attributing: 738 has sufficent AAI bleed capacity, it would have to switched on though. however icing accidents on approach usually appears earlier (when setting flaps) and impact path often near vertical.
-thrust loss due to malfunction: possible (777 EGLL) but would be a first for 738 therefor also unlikely unless birds were ingested.
-thrust loss due to system operation error: possible: EAI could have been switched off, Autothrust could have been in wrong mode (off?). not unlikely or possibly contributing.
Engines or thrust automation are very likely to be involved due to the position of the crash because thrust increase would probably be asked for just after the final flap setting, usually some 3NM out. Ice protection of engines and training or distraction may be involved, even birds.
Often (usually) a number of factors are involved: just out of my hat: frozen water in fuel leading to single engine thrust loss which was noticed late by crew and PNF (captain?) then concentrated on instruments or procedure while unexperienced FO did not increase thrust on other engine and lost speed/energy control. or another of 20000 possibilities and combinations .... this one will be solved: cockpit (switch positions), CVR and FDR are available.