People across Russia have honoured Alexei Navalny's memory by gathering at Orthodox churches, leaving flowers at public monuments or holding one-person protests.
Outside Moscow's Christ the Saviour Cathedral today, several mourners were stopped by police for an ID check.
Videos published by independent Russian news outlet SOTAvision also showed Russian police stationed nearby.
As of this afternoon, at least 27 had been detained in nine Russian cities for showing support for Mr Navalny, according to the OVD-Info rights group, which tracks political arrests.
They included Sergei Karabatov, 64, who laid flowers at a Moscow monument to victims of political repression, along with a handwritten note saying: "Don't think this is the end."
Also arrested was Aida Nuriyevawho stood in a street with a sign saying: "Putin is Navalny's murderer."
