Stay with the clip above until near the end (2:47) when the explosion occurs. The only information I can find on this fire comes with the description attached to the video by ffrick73. The fire was Sunday at 23rd Street and State Route 20 in Paterson, New Jersey:
According to bystanders, owner was in front of shop when someone ran in to tell him the back was on fire. Passersby helped owner remove dog safely before fire engulfed the structure. Several explosions heard from stored cans of RC motor gas.