There were at least a couple of snipers on location walking back to their dark colored unmarked car. One was carrying his, then set it on the ground--Harris bipod extended. Another rifle was sitting on the hood, partially obscured by LEOs talking.
There was another team with FBI tags.
Everybody was in Tac gear.
Everything is going to be done by the book in this investigation. They were waiting for a search warrant to begin looking in the car, They're probably videotaping every minute of the detainees incarceration and limiting access so that they can later show that these guys were treated well and were not touched. I wouldn't be surprised if the cops had a public defender standing by in case the guy wanted a lawyer.
Everything by the book so they can interogate, charge, try, convict and sentence with no question of an appeal.