Deputy Chief Jim Riches from the New York fire department, who lost his firefighter son Jimmy on September 11th aged 29, has travelled to Guantanamo Bay to see the trial of those believed to be responsible.
He explained how the defendants are refusing to co-operate with the proceedings of the court.
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"Rubble fell in on intensive care patients" in the early hours of Wednesday, medics said.
The inquiry's most senior lawyer is said to be considering stepping down after disagreeing with its chairwoman Alexis Jay over its future.
The tennis superstar said she was being driven by her nephew when she saw a police officer and was worried about what might happen.