The police were called after suspicious devices were found at a Florida campaign office. It was quickly determined that the devices were likely part of a prank.
A plastic prank device that can be purchased on Amazon for $13.97 was the cause of the problem.
Sounds like an annoyatron or a clone. A tiny device that randomly beeps with a time interval just long enough to be hard to find and annoying. They've been around for a couple decades.
Once upon a time I wired up a tiny little audio mux and attached it to my boss’s speakers, along with a bluetooth receiver. I was able to use my phone to inject random Mario sound effects into his music stream all day.
He was convinced he had a virus so he unplugged his audio from the computer, and to his surprise the speakers kept playing sounds sporadically.
The good ones don’t even use the same time interval each time. They’re all over a minute or two, but sometimes like 5 or 6 minutes. They’re truly diabolical.