STATter911 has the full story here.

Under the videos is an account from ACFD3.com

December 7, 2008 – At 1234 hours communications dispatched units to 124 Rolling Trace, in the City of Falls Church, for a structure fire. Truck 106 arrived first on the scene to find a garage unit three-story above grade, middle-of-the-row townhouse of lightweight construction with heavy fire showing from the front door on the first floor. Heavy smoke was pushing from the the second and third floors. Truck 106’s officer met with the occupant that advised everyone was evacuated and accounted for and that there was ammunition in the garage that was detonating. Shortly after their initial report, Truck 106 advised that the interior stairs had collapsed and requested a second alarm. Fire was now through the roof and the operation was declared defensive. Five minutes after the arrival of the first units the entire third floor collapsed to the second floor. Numerous exterior handlines, a RAM monitor and the ladder pipes from Truck 106 and 410 were used to bring the fire under control. Units were immediately deployed into the B and D exposures and aggressively opened up to check for fire extension. The fire separation walls between the units performed very well resulting in only minor fire extension. The blaze was brought under control within 30 minutes. Crews utilized ground ladders and handlines to extinguish remaining hot-spots. Battalion 112 (Blankenship) had the command. The only injuries were sustained by the occupant of the home.

Units on the call:

Engine 428, 108, 102, 103 Truck 106, 410, Rescue 104, Medic 106, Battalion 112, 111, EMS 112, Safety 114

2nd alarm Engine 410, 413, 101, Tower 104

Other units on scene Light and Air Unit, Command Unit.