CONCORD, N.C. (AP) — Fox Sports said on Monday it still had not determined why an overhead TV camera cable snapped during the Coca-Cola 600.
The network says a full investigation is under way and use of the camera is suspended indefinitely. Earlier, NASCAR said it would wait for Fox Sports to conclude its review before deciding if such technology would be used in the future.
Charlotte Motor Speedway said 10 people were injured when part of the drive rope landed in the grandstand; three were taken to hospitals. All were checked out and released soon after.
In a statement, Fox said it was "relieved and thankful to know that the injuries to fans caused then CAMCAT malfunctioned at Charlotte Motor Speedway were minor."
The network again apologized for the disruption.
Several drivers, including then-leader Kyle Busch, reported damage to their cars from the rope.
NASCAR spokesman Kerry Tharp told The Associated Press on Monday that there were no plans to use the system at upcoming races "so we'll have ample time to review."
The network said the system was provided by Austrian company CAMCAT. The rope that failed was certified for a breaking strength of 9,300 pounds and was only bearing less than 900 pounds of force during the race, according to Fox Sports.
The network said it's reviewing with CAMCAT equipment maintenance records, history and installation information and plans to share its findings with NASCAR and Charlotte Motor Speedway.
The network said the system was used successfully at the Daytona 500 and was set up and working at last week's Sprint All-Star race in Charlotte. Fox's final NASCAR telecast this year comes Sunday at Dover International Speedway.
Tharp said NASCAR would let the network determine what went wrong.
"We'll sync up with them on what they have learned this week and go from there," he said.
The network explained how the drive rope moves the camera back and forth and failed near its turn one connection. The camera, it said in a statement, did not come down "because the guide ropes acted as designed."
The rope, Fox said, was made of Dyneema, which it described as "an ultra-strong synthetic that has the same approximate strength of a steel wire with the same diameter." It said the rope was less than a year old, had been factory-tested by its manufacturer and its breaking strength was certified before shipment. The rope was also inspected by CAMCAT when it was received last June.
According to OnlineRopes.com, Dyneema has the "highest strength-to-weight ratio of any manmade material in the world. On weight-to-weight base, it is up to 15 times stronger than steel."