ET-409 crashed on take off from Beirut International Airport. Initial reports cited witness descriptions of lightening strikes. However, after viewing a security video, it appears the left engine is compressor stalling, a precursor to an engine coming apart.

Compressor stalls are a jet engines version of backfiring, and come with flashes of white flames out of the engine intake. Foreign object damage to compressor blades is normally the cause.

I suspect left engine failure and subsequent fire will be a primary causal factor.