PASCO, WA - Firefighters in Pasco are trying to figure out how an RV caught fire at the Russ Dean Family RV Storage Lot in Pasco Wednesday morning. The Russ Dean operations manager says workers started the older RV to warm it up and after a few minutes it burst into flames. No one was inside at the time. The RV company was prepping the vehicle for auction. Three other RV's were also damaged. The company would not comment on the value of the vehicles.