The number of homes damaged or destroyed by a wildfire near Reno more than doubled Saturday to at least 72 as firefighters surveyed remote areas in their continued drive to fight the blaze, which was 80% contained at nightfall.

Officials believe arcing power lines are the likely cause of the 2,000-acre Caughlin fire. Fire officials expect to have it fully contained by the middle of next week, according to a statement from the Reno Fire Department.

Officials began allowing the nearly 10,000 people who were evacuated to return to their homes at noon Saturday.