First thing the authorities will be looking for security cameras to back track the movement of the RV.
Next the serial numbers on the RV will be found and another team will compile it's history.
Since no group has stepped up to claim it , yet.
Many will follow the "lone wolf " theory.
The human remains said to have been found could be a red herring.
This whole incident could have been a diversion for another crime taking place elsewhere in the city.
Knocking out communications and tying up the police.