The official government inquiry into the accident called officials, drivers, and team personnel to be questioned and give evidence. The wreckage was examined and tested and, finally, returned to Mercedes-Benz nearly 12 months after the catastrophe. In the end the enquiry ruled that no specific driver was responsible for the crash, and that it was merely a terrible racing incident. The death of the spectators was blamed on inadequate safety standards for the track design. Tony Rolt and other drivers had been raising concerns about the pit straight since 1953.