It’s possible that there was some kind of explosive devise in the suitcases because there’s a hole where there shouldn’t be. Bags are put into aluminium containers but, as the pictures of the plane show, they aren’t in the aluminium container anymore. It’s possible that the container was blown open, although it’s not certain, but it is interesting to see the bags through the hole. How else could that be if not an explosion?
One has to appreciate how intensely the writing is trying to hype the "fear factor", when the logical explanation may prove something entirely more pedestrian.