Four men charged in connection with Friday's concert hall attack near Moscow are being held in custody, awaiting trial on terrorism charges. At least 139 people were killed in Friday's assault - the deadliest on Russian soil for nearly 20 years. A branch of the the so-called Islamic State, based in Afghanistan - known as ISIS-K - claims responsibility for the attack - a claim borne out by French and US intelligence sources.

Chapters:
0:00 Suspects held in custody
2:40 Mariana Katzarova, UN Special Rapporteur on human rights in Russia
7:31 Sergei Davidis, Memorial Human Rights Center

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