Two 15-year-old boys are under arrest after a car theft spree that Maine State Police say caused $50,000 in damage to some of the cars and to the Litchfield Fairgrounds.

Eight vehicles were stolen over the course of a week, police say, seven from Maine Avenue Auto Sales, a used car dealer in Farmingdale, and one from a resident at the Foggy Bottom Campground.

State police say the boys, one from Farmingdale and one from Whitefield, were arrested after one of them was caught trying to steal a ninth vehicle. The teenagers are charged with felony theft, burglary, aggravated criminal mischief and misdemeanor unauthorized taking of a motor vehicle, police said.

The thefts began June 21. State police Sgt. Chris Rogers said a 1979 Porsche was stolen from the Farmingdale campground and found abandoned with the motor running on Bowman Street in Farmingdale after residents reported a car being driven erratically in the neighborhood.

Among the seven vehicles stolen from the car lot was a 2000 Chevrolet Tahoe, which was later found inside one of the buildings at the Litchfield Fairgrounds. There was evidence the Tahoe had been used to ram the gate, and it had damaged some of the fields at the fairgrounds.

Another stolen vehicle was found in the parking lot of Uncle Henry’s on Route 17 in Augusta. One of the cars had been returned to the car lot covered in mud and grass, both inside and out.

Last Friday, state troopers responded to Pond Road in West Gardiner, where two more stolen cars were used to damage fields and one was left behind. State police say fields in Lincoln County also were damaged.

The other stolen cars were two Subaru Outbacks, a 2005 Pontiac Grand Prix and a 2003 Mazda Protégé.

Police say the boys also stole a license plate from a parked car in Farmingdale. The plate, with the number “STOL3N,” was recovered from one of the stolen cars.