which their complaints have been dealt with by the authorities must be considered to constitute inhuman treatment contrary to Article 3.
101. The Court therefore concludes that there has been a violation of Article 3 of the Convention also in respect of the applicants.
V. Alleged violation of Article 5 of the Convention
102. The applicants further stated that Aslanbek Astamirov had been detained in violation of the guarantees of Article 5 of the Convention, which reads, in so far as relevant:
"1. Everyone has the right to liberty and security of person. No one shall be deprived of his liberty save in the following cases and in accordance with a procedure prescribed by law:...
(c) the lawful arrest or detention of a person effected for the purpose of bringing him before the competent legal authority on reasonable suspicion of having committed an offence or when it is reasonably considered necessary to prevent his committing an offence or fleeing after having done so;
...
2. Everyone who is arrested shall be informed promptly, in a language which he understands, of the reasons for his arrest and of any charge against him.
3. Everyone arrested or detained in accordance with the provisions of paragraph 1 (c) of this Article shall be brought promptly before a judge or other officer authorised by law to exercise judicial power and shall be entitled to trial within a 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."
103. In the Government's opinion, no evidence was obtained by the investigators to confirm that Aslanbek Astamirov was detained in breach of the guarantees set out in Article 5 of the Convention. He was not listed among the persons kept in detention centres.
104. The Court has previously noted the fundamental importance of the guarantees contained in Article 5 to secure the right of individuals in a democracy to be free from arbitrary detention. It has also stated that unacknowledged detention is a complete negation of these guarantees and discloses a very grave violation of Article 5 (see {Cicek} v. Turkey, No. 25704/94, § 164, 27 February 2001, and Luluyev, cited above, § 122).
105. The Court has found it established that Aslanbek Astamirov was detained by State servicemen on 5 August 2002 and has not been seen since. His detention was not acknowledged, was not logged in any custody records and there exists no official trace of his subsequent whereabouts or fate. The Court further considers that the authorities should have been more alert to the need for a thorough and prompt investigation of the applicants' complaints that their relative 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 him against the risk of disappearance.
106. Consequently, the Court finds that Aslanbek Astamirov was held in unacknowledged detention without any of the safeguards contained in Article 5. This constitutes a particularly grave violation of the right to liberty and security enshrined in Article 5 of the Convention.
VI. Alleged violation of Article 13 of the Convention
107. The applicants complained that they had been deprived of effective remedies in res
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