US
Prime Minister Malcolm Turnbull says he was "shocked and appalled" at the revelations
The Yemeni man was arrested by Pakistani police and transferred to US custody in December, 2001
Committee formed last year to look into matter yet to meet.
Obama has tried to close the facility, but has been thwarted by opposition in Congress
Some suggest the reason he has been held so long at Guantanamo is because he may have witnessed the torture of others