Well, everyone's speculating anyway.
The aircraft certainly stalled, horrifying wing rock at the point of stall.
Either wing drop, or more likely IMHO the guys use bank to slice the nose.
Unfortunately, not nearly enough altitude to recover.
I reckon pallets secure, but cargo not. A heavy item slips its bonds and escapes stowage. A fairly light load needs only one vehicle to move rearwards to put C of G outside controlable limits.
Utterly tragic, some of our own have perished needlessly.
Let's learn some lessons so their lives are not lost in vain.