reasonable time or to release pending trial. Release may be conditioned by guarantees to appear for trial.
4. Everyone who is deprived of his liberty by arrest or detention shall be entitled to take proceedings by which the lawfulness of his detention shall be decided speedily by a court and his release ordered if the detention is not lawful.
5. Everyone who has been the victim of arrest or detention in contravention of the provisions of this Article shall have an enforceable right to compensation."
126. The applicants maintained their complaint. They insisted that their relatives' detention had not satisfied any of the conditions set out in Article 5 of the Convention, that it had had no basis in national law and had not been in accordance with a procedure established by law or been formally registered.
127. In the Government's submission, the investigation had obtained no evidence to confirm that the applicants' relatives had been detained by State agents in breach of the guarantees set out in Article 5 of the Convention.
128. The Court has frequently emphasised the fundamental importance of the guarantees contained in Article 5 for securing the rights of individuals in a democracy to be free from arbitrary detention at the hands of the authorities. In that context, it has repeatedly stressed that any deprivation of liberty must not only have been effected in conformity with the substantive and procedural rules of national law but must equally be in keeping with the very purpose of Article 5, namely to protect the individual from arbitrary detention. To minimise the risks of arbitrary detention, Article 5 provides a corpus of substantive rights intended to ensure that the act of deprivation of liberty is amenable to independent judicial scrutiny and secures the accountability of the authorities for that measure. The unacknowledged detention of an individual is a complete negation of these guarantees and discloses a most grave violation of Article 5 (see, among other authorities, {Cakici}, cited above, § 104).
129. It has been established above that Ilyas and Isa Yansuyev were detained on 13 February 2003 by State agents and have not been seen since. Their detention was not acknowledged, was not logged in any custody records and there exists no official trace of their subsequent whereabouts or fate. In accordance with the Court's practice, this fact in itself must be considered a most serious failing, since it enables those responsible for an act of deprivation of liberty to conceal their involvement in a crime, to cover their tracks and to escape accountability for the fate of a detainee. Furthermore, the absence of detention records noting such matters as the date, time and location of detention and the name of the detainee, as well as the reasons for the detention and the name of the person effecting it, must be seen as incompatible with the very purpose of Article 5 of the Convention (see Orhan, cited above, § 371).
130. The Court further considers that the authorities should have been alert to the need to investigate more thoroughly and promptly the applicants' complaints that their relatives had been detained and taken away in life-threatening circumstances. However, the Court's findings above in relation to Article 2 and, in particular, the conduct of the investigation leave no doubt that the authorities failed to take prompt and effective measures to safeguard Ilyas and Isa Yansuyev against the risk of disappearance.
131. Consequently, the Court finds that Ilyas and Isa Yansuyev were held in unacknowledged detention in complete disregard of the safeguards enshrined in Article 5, and that this constitutes a particularly grave violation of their right to liberty and security enshrined in Article 5 of the Convention.
VI. Alleged violation of Article 13 of the Convention
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