From the article,
"...what's more concerning, is he may have been planning an event, and he's checking to jam up public safety communication before that," said Mobile County 911 Director Charlie McNichol."
LE in Mobile County/City is encrypted. I am made to think that the organized criminal/terrorist mentality is, if they can't listen, the alternative is to shut down communications.
Don't be surprised if this becomes standard practice for nefarious groups everywhere where communications encryption is utilized. The even more sad aspect is that potential extra eyes & ears of law abiding citizens is sharply curtailed by not being able to hear what is happening in the community.