Boaters, beachgoers and fishermen who spend time in the chilly waters of New England and Canada are learning to live with great white sharks.

Scientists link expanded shark sightings in some New England waters to increased availability of the seals that the sharks hunt.

Officials in Scarborough informed the public of a "potential shark sighting in local waters, specifically in the area off the south tip of Richmond Island, Crescent Beach State Park, Higgins Beach and Pine Point Beach" located along the Maine coast. All beaches are within a half-hour's drive of Portland.