Another case that Blue Book's critics seized upon was the so-called Portage County UFO Chase, which began at about 5.00am, near Ravenna, Ohio on April 17, 1966. Police officers Dale Spaur and Wilbur Neff spotted what they described as a disc-shaped, silvery object with a bright light emanating from its underside, at about 1000 feet in altitude. They began following the object (which they reported sometimes descended as low as 50 feet), and police from several other jurisdictions were involved in the pursuit. The chase ended about 30 minutes later near Freedom, Pennsylvania, some 85 miles away.