NASCAR and Fox Sports have yet to reveal the cause of Sunday night’s accident in which a nylon camera rope fell onto the track and into the stands during the Coca-Cola 600. Ten attendees were injured with cuts and bruises and several cars damaged in the incident, which caused officials to temporarily halt the race at Charlotte Motor Speedway nearly a third of the way in. Use of the three-rope overhead camera system made by Austria-based CamCat has been suspended indefinitely, Fox said in a statement.