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That means that the authorities must always make a serious attempt to find out what happened and should not rely on hasty or ill founded conclusions to close their investigation or as the basis of their decisions. Furthermore, it must be both prompt and thorough. In order to be “effective”, such an investigation must firstly be adequate, which means that it must be capable of leading to the establishment of the facts and to a determination of whether the force used was or was not justified in the circumstances and of identifying and – if appropriate – punishing those responsible (see Jeronovičs, cited above, § 103).
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the former Yugoslav Republic of Macedonia, no. Bulgaria, 28 October 1998, § 102, Reports of Judgments and Decisions 1998 VIII, and for a full statement of principles by the Grand Chamber, El- Masri v. The obligation to carry out an e ffective investigation into allegations of treatment infringing Article 3 suffered at the hands of State agents is well established in the Court’s case-law (see Bouyid, cited above, §§ 114-23, Assenov and Others v. A selection of key paragraphs can be found below the judgment.
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