It looks like the fire department had quite a battle with Verizon over their unlimited plan, because it had a clause that allowed them to throttle when the fire department got above 25GB of transfer. The fire department claimed the throttling was so severe, it rendered the line nearly useless. Verizon said they'd lift the throttling if they upgraded their account, but the IT department didn't have authorization and were in the middle of an emergency.
ARS Technica has a pretty detailed account of the whole saga, which is being entered as evidence for the states who are filing suit to overturn the government's recent net neutrality decision.
Here's what I'm not getting: was this really part of that decision? Because it seemed like they had the right to throttle before. It seems as though after the decision, they got bolder and throttled more severely.