In this open letter Amnesty International writes further to its letter of 19 January about the pre-trial detention conditions of PFC Bradley Manning at the Quantico Marine Corps Base, Virginia. The organization remains concerned that, apart from visits which are allowed at week-ends, Bradley Manning continues to be confined for 23 hours a day to a small cell. Amnesty International strongly reiterates its concern that the combined deprivations imposed on Bradley Manning are in breach of the USA’s obligations under international law and standards to treat all those in its custody humanely.