Supposedly they pulled dead and dying kids out of the tunnels that criss cross all the buildings. Maybe they are burning out the tunnels to get rid of the shit, the stench and the evidence. Miles of tunnels will take a lot of burning.

They probably have decided to just explode a nuke in the heart of Washington. That is why the streets are all deserted. Then they can blame Russia, Bring in the Chinese troops and start taking away the guns.

All in the name of National Security.