A former US diplomat and now an analyst on East and South Asia, David Sedney, explains the role of the IS group in the Moscow attack and what we know about the suspects.
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The IS group - specifically Islamic State Khorasan - has claimed responsibility for the worst terrorist attack to hit Russia in 20 years.
Eight suspects have now been remanded in pre-trial detention over the concert hall attack that resulted in 139 deaths.
Analyst David Sedney was a former US deputy assistant secretary of defense for Afghanistan, Pakistan and Central Asia.
He told Rayane Tamer that the ISK group is a part of a broad, multi-continental movement that needs to be countered.
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