prime minister Boris Nemtsov, television host Ksenia Sobchak and liberal
activist Ilya Yashin were interrogated again for their role in
organizing recent rallies, including a May 6 protest that ended in
violent clashes with police.
Putin has taken a tougher approach toward the opposition since he began his third term as president in May.
Monday, police searched the properties of all three leaders and others.
A day later, police brought them in for questioning just an hour before
the massive anti-Putin protest in Moscow.