Blake Walsh was taken into custody Wednesday.
Investigators had been looking into a series of incidents where hay bales and grassy areas were set ablaze in the Williamsfield area. Two dumpster fires in Galesburg were also linked to the investigation.
The Knox County Sheriff's Department, Galesburg Police Department, and the Galesburg and Willamsfield Fire Departments worked together to identify Walsh as the person they say set the fires.
As of Thursday afternoon Walsh was in the Knox County Jail on a $50,000 bond.
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