Four members of the political punk group Pussy Riot who ran onto the pitch during the soccer World Cup final in Moscow have been detained immediately after their release from prison, the group says.
The group has claimed on its Facebook page that the four band members were detained by police on Monday as they were leaving the Moscow prison where they had completed a 15-day sentence for disrupting the match.
The reason for their detention was unclear, but the group said the members were accused of staging public events without prior notice, adding that they could face fines or a further 10 days in prison.
A Russian government source confirmed their detention but did not provide a reason, the TASS news agency reported.
The group said the activists were taken to police stations where they will be kept overnight.
During the July 15 World Cup final between France and Croatia at Moscow's Luzhniki Stadium, Pussy Riot members dressed in police-style outfits ran onto the field in protest at Russia's imprisonment of Ukrainian film director Oleg Sentsov, convicted on terrorism charges.
Pussy Riot became famous in 2012 when two of its members were imprisoned for more than a year for hooliganism over a protest in a prominent Moscow cathedral.