The low cement colored vehicle, a bomb disposal vehicle?
I don't know- I had never seen one like that before. From where I was at the time (looking at the city from the 9th floor of a parking garage on Spruce) ---the firemen put the cooler into the firetruck. The cement colored- very low (bus?) with the tiny square windows had pulled in front of the firetruck. The street would have been....16th or 17th and Spruce. An ambulance was also there.
Usually, if an alarm goes off in that neighborhood- the people are evacuated while the fire department is notified. The people wait outside while the firemen go in. It was so odd. There were NO people evacuated from the building when the fire truck and ambulance (and then cement looking truck/bus) pulled up....?