Human rights — Arrest and detention — Conditions of detention — Prisoner held incommunicado — Whether failure to treat prisoner with humanity and with respect for inherent human dignity — International Covenant on Civil and Political Rights, 1966

International tribunals — Competence — Procedure — United Nations Human Rights Committee — Optional Protocol to International Covenant on Civil and Political Rights — Communication alleging violations of Covenant — Whether submitted to other procedure of international investigation — Failure to exhaust domestic remedies — Absence of effective domestic remedies — Proof of allegations — Duty of State Party to furnish information — Whether allegations to be treated as substantiated in the absence of evidence to contrary from State Party