The Nicollet County Sheriff’s Office is warning area residents of a scam involving Lightning Protection Systems. Officials say that 3 or 4 adults have been going door-to-door in rural Nicollet County trying to sell lightning rods and cables. When homeowners agree to have work done, the scammers reportedly demand hundreds or thousands of dollars more than the original quote. The scammers tell victims they are from Mankato, when in fact they are from out-of-state and are not licensed, bonded or insured. They were last seen driving an unmarked blue Chevy pickup with Minnesota plates. No arrests have been made, but the individuals are known to have a history of theft by swindle in Minnesota and Iowa. Anyone with concerns about suspicious activity should contact their local law enforcement agency.