10.  The first applicant, Kęstutis Birutis, is a Lithuanian national born in 1974. The second applicant, Vidmantas Byla, is a Lithuanian national born in 1968. The third applicant, Laimonas Janutėnas, is a Lithuanian national born in 1976. At present the first and the second applicants are detained in the Lukiškės Prison in Vilnius. The third applicant is currently detained in the Pravieniškės Prison in the Kaunas region. 11.  The applicants, while completing their sentences in the Pravieniškės Prison, were suspected of participating in a riot that took place in the prison on 15 January 1997. 21 detainees, including the applicants, were accused of causing or taking part in the riot. 12.  The third applicant was released from prison after completing his original sentence on 14 February 1997. He was arrested on 25 June 1997 in the context of the proceedings for riot. The first and the second applicants were still completing their original sentences throughout these proceedings. 13.  During the pre-trial investigation two witnesses were examined on behalf of the third applicant. During the trial one witness was called by the Kaunas Regional Court on the third applicant’s behalf. The first and second applicants called no witnesses. 14.  On 3 November 1997 the Kaunas Regional Court convicted all the defendants in the case, including the applicants. The court found that the first and the second applicants had organised the riot and that they had also committed affray. They were sentenced to ten years’ imprisonment. The third applicant was found guilty of having actively taken part in the riot and sentenced to six years’ imprisonment. 15.  In establishing the first applicant’s guilt, the court referred to the statements of 17 anonymous witnesses who were mostly other detainees. These statements had been recorded by the prosecution during the pre-trial investigation. The secret witnesses testified that the first applicant had organised the riot. The court further referred to the statements at the pre-trial investigation of three co-accused, J, S and T, confirming the first applicant’s guilt. The Regional Court noted that J, S and T had subsequently changed their testimony, alleging inter alia that prosecutors had forced them to inculpate the first applicant. However, the court considered that the initial statements of J, S and T had been valid, and that they had only changed their evidence upon intimidation by the other defendants. The court also took account of the statements given during the trial by a complainant, a detainee belonging to “a lower caste among prisoners”. The latter had testified that the first applicant had assaulted him on 15 January 1997. The court further noted the evidence given at the trial by five members of the prison staff, alleging that the first applicant had organised the riot. The Regional Court found that on the day of the riot the first applicant had been under the influence of alcohol. In concluding that the first applicant was guilty of riot and affray, the court also mentioned indirect evidence: on-site inspection records, material evidence and expert examinations. 16.  In finding the second applicant guilty, the Regional Court referred to the statements by 19 anonymous witnesses recorded by the prosecution during the pre-trial investigation. The anonymous statements testified that the second applicant had also been an organiser of the riot. As was the case with the first applicant, the court rejected the later statements of J, S and T, finding that their original testimonies given during the pre-trial investigation had constituted sufficient grounds for establishing the second applicant’s guilt. The court also took account of the statements delivered at the trial by two complainants who were detainees belonging to “a lower caste among prisoners”. The latter had alleged that on 15 January 1997 the second applicant had beaten other detainees, attacked members of the prison staff and barricaded the prison. Evidence along the same lines was given by six members of the prison staff summoned during the trial. The Regional Court found that during the riot the second applicant had been under the influence of alcohol. The court also noted that the second applicant’s guilt in committing riot and affray was indirectly proved by on-site inspection records, material evidence and expert examinations. 17.  As to the grounds for the third applicant’s guilt, the Regional Court referred solely to the statements by six anonymous witnesses recorded by the prosecution during the pre-trial investigation. 18.  The Regional Court concluded that the first and the second applicants had been the apparent organisers of the riot of 15 January 1997, that they had been drunk, and that they had “induced detainees of lower castes to get involved in the offence”. The court also ruled that “the level of participation in the crime by [the third applicant] had been lower”. 19.  The applicants appealed, stating that they had not committed the offences alleged, that the statements of anonymous witnesses had been invalid, that the secret evidence had not been scrutinised either by the defendants or the court, and that the Kaunas Regional Court had ignored certain evidence given during the pre-trial investigation by other detainees. In their opinion, almost 300 inmates had taken part in the events of 15 January 1997. The applicants stated they had been victimised by the prison administration who had encouraged anonymous testimonies by other detainees, promising them favourable treatment. Furthermore, the “secret witnesses” had themselves allegedly taken part in the riot and had collaborated with the authorities in order to avoid prosecution. The prosecution also appealed against the first instance judgment, requesting more severe sentences. 20.  On 29 April 1998 the Court of Appeal dismissed the appeals, finding that the Regional Court had properly established the applicants’ guilt and imposed the correct sentences. It held that domestic criminal procedure permitted the first instance court to take account of evidence given by secret witnesses at the stage of pre-trial investigation, without summoning those witnesses to the trial. 21.  The applicants lodged a cassation appeal with the Supreme Court, complaining inter alia that the lower courts had not clarified the alleged controversy over the anonymous testimonies. 22.  On 20 October 1998 the Supreme Court rejected the appeals, finding that the lower courts had properly decided the case. It noted that the first and the second applicants had been convicted not only on the basis of the anonymous testimonies, but also by reference to the statements of the complainants and the prison staff. The Supreme Court found that the third applicant had basically been convicted by reference to the statements of anonymous witnesses. However, in the view of the cassation court, those statements had been consistent and supplementary to other evidence confirming his guilt. No procedural irregularities were found in connection with the courts’ refusal to examine the anonymous witnesses.