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B. The Court's evaluation of the facts
72. The Court points out that a number of principles have been developed in its case-law as regards cases where it is faced with the task of establishing facts on which the parties disagree. As to the facts that are in dispute, the Court reiterates its jurisprudence requiring the standard of proof "beyond reasonable doubt" in its assessment of evidence (see {Avsar} v. Turkey, No. 25657/94, § 282, ECHR 2001-VII (extracts)). Such proof may follow from the coexistence of sufficiently strong, clear and concordant inferences or of similar unrebutted presumptions of fact. In this context, the conduct of the parties when evidence is being obtained has to be taken into account (see {Tanis} and Others, cited above, § 160).
73. The Court is sensitive to the subsidiary nature of its role and recognises that it must be cautious in taking on the role of a first-instance tribunal of fact, where this is not rendered unavoidable by the circumstances of a particular case (see, for example, McKerr v. the United Kingdom (dec.), No. 28883/95, 4 April 2000). Nonetheless, where allegations are made under Articles 2 and 3 of the Convention, the Court must apply a particularly thorough scrutiny (see, mutatis mutandis, Ribitsch v. Austria, 4 December 1995, § 32, Series A No. 336; and {Avsar}, cited above, § 283) even if certain domestic proceedings and investigations have already taken place.
74. The Court reiterates that it has noted the difficulties for applicants to obtain the necessary evidence in support of allegations in cases where the respondent Government are in possession of the relevant documentation and fail to submit it. Where the applicant makes out a prima facie case and the Court is prevented from reaching factual conclusions owing to the lack of such documents, it is for the Government to argue conclusively why the documents in question cannot serve to corroborate the allegations made by the applicants, or to provide a satisfactory and convincing explanation of how the events in question occurred. The burden of proof is thus shifted to the Government and if they fail in their arguments, issues will arise under Article 2 and/or Article 3 (see {Togcu} v. Turkey, No. 27601/95, § 95, 31 May 2005, and Akkum and Others v. Turkey, No. 21894/93, § 211, ECHR 2005-II).
75. The Court notes that despite its requests for a copy of the investigation file into the kidnapping of Said-Magamed Tovsultanov, the Government produced only part of the documents from the file, running up to 170 pages. They submitted that they had enclosed with their observations "the main contents of the criminal case file" but did not explain the reasons for their failure to submit the remaining documents.
76. The Court has found the Russian State authorities responsible for extra-judicial executions or disappearances of civilians in the Chechen Republic in a number of cases, even in the absence of final conclusions from the domestic investigation (see Khashiyev and Akayeva, cited above; Luluyev and Others v. Russia, No. 69480/01, ECHR 2006-XIII (extracts); Estamirov and Others, cited above; and Baysayeva v. Russia, No. 74237/01, 5 April 2007). It has done so primarily on the basis of witness statements and other documents attesting to the presence of military or security personnel in the area concerned at the relevant time. It has relied on references to military vehicles and equipment, on witness accounts, on other information on security operations and on the undisputed effective control of the areas in question by the Russian military. On that basis, it has concluded that the areas in question were "within the exclusive control of the authorities of the State" in view of military or security operations being conducted there and the presence of servicemen (see, mutatis mutandis, Akkum, cited above, § 211, and Zubayrayev v. Russia, No. 67797/01, § 82, 10 Janua
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