Two mobile home fires in Truesdale last week were caused by arson, according to Warrenton Fire Chief Mike Owenby. The fires occurred in the Bel-Aire Mobile Trailer Park. The first fire was reported just before midnight on Wednesday, Aug. 26, and flames were noticed in a nearby mobile home about 2 1/2 hours later. "These were both set," Owenby said. A release from the Truesdale Police Department confirmed the fires were "suspicious in nature." The Missouri State Fire Marshal's office also assisted in the investigation. "The investigation on the fires is completed," Owenby said. "Who did it is ongoing." Citing the continuing investigation, Owenby declined to comment further or release anymore information on the cause. Owenby encourages anyone with information related to the fires to call the state arson hotline at 1-800-39-ARSON (1-800-392-7766). He said a $5,000 award is in place for information that leads to an arrest. Owenby said crews responded to the first fire at 11:57 p.m. on Aug. 26. The second fire broke out just around the corner around 2:30 a.m. In both fires, Owenby said crews were able to extinguish the flames quickly. Both trailers were unoccupied at the time. Owenby said occupants of the first trailer had moved their belongings out of the trailer earlier in the day. The second trailer had been vacant for a couple of weeks. The second fire was noticed during a preliminary investigation of the fire at the first mobile home. Owenby said a firefighter noticed smoke and thought the fire had restarted. As he walked to the back of the residence and looked toward the remainder of the trailer park, he saw a small fire through the window of the second mobile home. Owenby said crews spent nearly six hours fighting both fires.