It's not empty, their still in business. All the fire trucks were over at 3counties at around 19:00 - 20:00 (I never went out again after this).
Iirc, there was two fire engines over at 3counties itself, and another one over at the Fender Way flyover. The place was clogged with smoke the first time I went past, I was in a hurry so didnt have to time to stop and see what was going on. Upon returning later on, the fire investigation unit and a couple of cars were also in attendance, again, outside 3counties.