If LEOs wanted to keep it quiet, it's easy to shut down cell access, even down to the device serial number.
If things were truly dicey, the last damned thing I would be worried about is my cell feed to fuckbook or twatter.
If there was something truly obvious or gory, I would have recorded it and GTFO with it.
This just smells rancid to me - has totally staged feel to it. Reminded me of school shooting bullshit