Madisonville Police are investigating four fires as possible arson. Police tell us they responded to three separate fires in the early Saturday. They happened around South Main Street. We're told the first fire was reported around 5:20 a.m. at the Sonic Drive-in on 815 South Main Street. Officials tell us an outside storage building had suspiciously caught fire. The second fire was reported less than 10-minutes later at a residence on the 40th block of West Jagoe. The outside of the residence suspiciously caught fire, police say. "The man who lives there was standing out in front of our house and I asked him, 'What happened?' He said his house was on fire.