If the strings have been truly cut: network-to-network comms, chain-of-command, etc
Then sending fake bombs to themselves makes perfect sense.
All of this shit yesterday was sloppy as fuck plus how much footage of EOD do we actually have? Something like this would normally garner 24:7 coverage from the sites of delivery.
The nation by and large is ready for the next news cycle. The stage, it would seem, has been set.