Explosion in the cargo bay?
The close-up photo doesn't appear to reveal any evidence of explosive-related burns or the like, so if it wasn't an airframe/mechanical failure of some sort, may have been a can/cannister/tank under pressure in the cargo or passenger baggage that exploded.
It doesn’t look like an explosion at all. It looks like a faring on the wing root came loose. When the wind pulled the faring off, it ripped a hole in the pressurized fuselage leading to additional damage from decompression.
Explosion in the cargo bay?Looks just forward of the cockpit ...
/sarc
LOOK at the proximity to the outward-opening forward cargo bay door though ...