Investigators say the fire yesterday at a storage unit on Kuenzli Street was caused by squatters using fire for warmth. Several other units were damaged by the flames but no homes or other businesses nearby were impacted. Reno Fire Captain Patrick Mooneyhan says with the cold weather, more of these types of fires are happening. Since September, there have been fourteen cases of homeless people starting fires that get out of control. Five of those fires were in vacant buildings.