Sheriff Tom Jones says the Grant County fires included blazes that destroyed four haystacks valued at $300,000, and an abandoned former barracks. Fires in Franklin and Adams counties damaged or destroyed abandoned buildings and other property.
Jones says two half-brothers from Eltopia and two women were arrested Sunday night when they returned to the scene of a Franklin County fire. A sheriff's deputy spotted a car that matched the description of a vehicle witnesses had seen earlier.
The four were booked for investigation of arson, malicious mischief and criminal trespassing.
The investigation continues.