WATERFORD — A father and son from Massachusetts are facing charges after a fight at a Maine campground landed two men in the hospital.

Maine State Police say 40-year-old John O’Brien and his 19-year-old son, Jonathan O’Brien, both of Billerica, Mass., were arrested Thursday and charged with aggravated assault in connection with a brawl Wednesday night at the Papoose Pond Resort and Campground in Waterford.

They were held at the Oxford County Jail on $50,000 cash bail each.

Police tell the Sun Journal that 43-year-old William Powell of Farmington was flown to Central Maine Medical Center with serious facial injuries. He is in good condition. Forty-six-year-old Michael Chapman of Farmington was taken to Stephens Memorial Hospital in Norway.

More arrests may be made.

Police did not say what sparked the fight.