I didn't see exactly where it was coming from, I didn't have the chance to adjust the mirror so I could see exactly. But it was coming from the right rear, near the wheel or exhaust. I wish I could have seen exactly, it would make this easier. But it was a LOT of little fire/spark particles that were pretty large. It wasn't a fine shower of sparks like a grinder, more like a cutting torch. They were visible out the rear view and the right side mirror.