Authorities say three RVs and one boat caught fire at an impound yard on Sage Street in Reno early Wednesday morning. 

Reno Fire received the call around 4:45 a.m. 

Officials say the cause is under investigation but that it is most likely human-caused. Crews say two other RVs were also possibly burned in the fire, but firefighters are still investigating. 

There are no road closures or injuries.