The prison camp where Pussy Riot punk Maria Alyokhina is being held broke the law by keeping her in isolation for too long, prosecutors said Wednesday, raising the possibility she could be transferred to another prison. Alyokhina, 24, is serving a two-year sentence in Corrective Labour Camp No.28 in the Perm region in the Urals mountains after her feminist punk-rock group staged a performance in a Moscow church in February last year.

Moscow police made several arrests on Friday as dozens of activists staged a picket outside the headquarters of the Russian prison service on women's day to call for the release of punk rock group s Pussy Riot. Around 50 people braved freezing temperatures to demonstrate outside the building, holding placards calling for the release of Nadezhda Tolokonnikova and Maria Alyokhina. They all stood apart in order not to require the official permission needed in Russia for any protest numbering more than one person, an AFP correspondent reported.

Russian migration officials disrupted a Moscow play by a Swiss director about the trial against punk band Pussy Riot on Sunday, while religious activists caused a commotion outside. The political play "The Moscow Trials" by director Milo Rau tells the story of last year's trial against three singers of the feminist band -- one of whom, Yekaterina Samutsevich, has since been freed and is now taking part in the play.

A Russian court on Friday ordered the cancellation of several formal reprimands issued to a jailed Pussy Riot member in a move her supporters hailed as a victory for the embattled punk band. Maria Alyokhina, who is serving a two-year sentence in a prison camp over a protest against President Vladimir Putin in Moscow's cathedral last year, went to court to contest reprimands meted out for transgressions including getting up late and being rude to prison staff.