Some Guantanamo detainees are known to have officially reported abuse.Many Guantanamo detainees are known to have reported abuse when they appeared before their Combatant Status Review Tribunals, their Administrative Review Board hearings, or the Guantanamo military commissions of the ten detainees who have been charged. Some detainee's transcripts record that they reported abuse, without recording any reaction from the field grade officers they addressed. The BBC reported that: "The ARB's chief promised to investigate this."