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A federal investigator said witness reports and behavioral profilers led authorities to believe that two white men were responsible for the fires. Witnesses said they saw two men in a sport utility vehicle near a number of the fires.
"They're not youths or teens. It's probably someone in their 20s or 30s. We believe they're pretty much inseparable. They're something like bosom buddies," said Eric Kehn, a spokesman for the federal Alcohol, Tobacco, Firearms and Explosives agency.
Evidence from one of the earlier fires indicates the perpetrators may have been briefly trapped inside the building and may have been hurt, said Jim Cavanaugh, ATF regional director.