[don-o]

Feds were present per Sgt Swanton who was very chatty for a few hours until someone put the quietus on him.

[digger48]

Don't the Feds normally take control in a situation like this, or does that only happen in the movies?

I remember that Fed presence was being claimed in the initial reports, but now the focus from the media seems to be on only the local LEOs

[Smokin' Joe]

Part of Swantons CV from National Institute of Crime Prevention (emphasis mine)

During the next four years, Swanton was assigned to the Special Operation’s Unit (S.W.A.T. Team) where he became certified as a Crisis Negotiator. Swanton has attended many courses in negotiation and holds basic through advanced certificates in Crisis Intervention. Sgt. Swanton is currently the team leader over the Crisis Intervention Unit. While in Special Operations he furthered his training by attending a course provided by the National Guard on helicopter assaults and courses on basic through advanced S.W.A.T. Team Tactics. While in Special Operations Swanton was also involved in the aftermath at Mount Carmel and was awarded the Police Commendation bar along with his other teammates for their involvement.

So, Swanton and ATF people are likely no strangers.