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He has been the target of multiple criminal probes, while his Anti-Corruption Foundation is regularly raided by police and investigators.
He has served numerous terms in police cells for organizing illegal protests.
Yarmysh said they had been on a work trip to Tomsk.
Former US ambassador to Moscow Michael McFaul tweeted: "Praying @navalny will be ok." (Writer: Anna Malpas)
Source: http://u.afp.com/36vJ