Russia metro attack staged by Kyrgyz suicide bomber: Kyrgyzstan
There is no evidence the detainees, who are citizens of Central Asian states, are in any way linked to Monday's bomb attack in a St Petersburg metro train, Russia's state investigative committee said in a statement.
The detainees are suspected of being active since November 2015 in recruiting other Central Asian immigrants for "terrorist activity" and for Islamic State as well as another banned movement Nusra Front.
Extremist literature has been found during a search of the detainees' living quarters, the statement added.
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