The suspects remanded on March 25 include the brothers Aminchon and Dilovar Islomov, and their father, Isroil Islomov. The three men live and work in Russia's northwest Tver Oblast.
3 more suspects detained in connection with Moscow concert hall terrorist attack chinadaily.com.cn - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from chinadaily.com.cn Daily Mail and Mail on Sunday newspapers.
Islamic State jihadists have said several times since Friday that they were responsible, and IS-affiliated media channels have published graphic videos of the gunmen inside the venue.