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Poor design and driver error were blamed for the crash.
Due to driver error and equipment problems, the 2004 run was the only one he has so far completed successfully.
Investigators in both incidents are focusing on driver error as a possible cause.
Among the other factors being examined are weather conditions and possible driver error.
He said in his opinion the accident was caused through driver error.
The statistics are quite clear on this and it's "driver error or reaction".
He said the investigators had not yet determined the nature of the driver error.
A more recent statement by the police has placed the blame of the crash on driver error.
The cause of the accident was concluded to be driver error due to poor staff training.
"The best we can tell, it was driver error," he said.