I hope that's what it was, but there appeared to be a body that got loaded into what looked like the coroner's truck. I was climbing and had a higher vantage point, but the vehicles were parked such that the view of the presumed body (covered by a sheet) was blocked from traffic. When they loaded it into the truck, they stopped traffic. About five rafts took out at that spot as well, which is not a normal takeout.
My condolences to all involved if there was a fatality. Hopefully it was just a training drill.