Bandoliers are for belt fed. I suspect it was web gear with magazine pouches (like found on local swat teams and armed federal agents these days).
Other reports said a shotgun was used. If, as the witness says, he (or she) saw "bullets" in the bandoliers (rather than magazines in pouches), then my guess is it was a shotgun, and the "bullets" in the bandoliers were actually shells.
Bandoliers are for belt fed.
Not really. Bandoliers are belts with many pouches on them holding magazines, loose ammo, or clipped ammo. I own several.
Belted ammo is belted ammo, for a belt fed weapon, as you say.
I don't think so.
Per Wikipedia: A bandolier or a bandoleer is a pocketed belt for holding ammunition. It was usually slung sash-style over the shoulder, with the ammunition pockets across the midriff and chest. In its original form, it was common issue to soldiers from the sixteenth to eighteenth centuries, and contained either pre-packed chargers, small containers of wood, metal or cloth containing the measured amount of gunpowder for a single shot with a muzzle-loading muskets or other guns, or early forms of cartridges also containing a ball. It might also carry other accessories for shooting, or grenades. Any bag worn in the same style may also be described as a bandolier bag; equally ammunition holding pocketed belts worn round the waist may also be called bandoliers.
You seem to confuse bandoliers with machine gun belts. Not the same thing.