Fire trucks

At about 9:20 as I was crossing the Ashley River bridge heading into work this morning (trying to catch up on x-ray equipment surveys), there was this long slow moving procession of fire trucks headed the other way into West Ashley. Lights flashing, sirens wailing but apparently not in a hurry to get anywhere.

Not sure where they were headed or what occasion they were marking, but they were going somewhere. Anybody out there know what they were doing?