Two members of the protest group Pussy Riot say they have been arrested in the Russian resort of Sochi where the Winter Olympics are being held.
Maria Alyokhina and Nadezhda Tolokonnikova, who were freed from jail in December, said they had been detained in the centre of the town on suspicion of a criminal offence.
They spent two years in prison for a singing a protest song in a cathedral.
The town of Sochi is some distance from where the Games are taking place.
Nadezhda Tolokonnikova told the BBC's Steven Rosenberg that she and Maria Alyokhina were being held at a police station after being detained on suspicion of "theft". They have not yet been officially charged.
Ms Tolokonnikova said that they had arrived in Sochi on Sunday to perform a new song, Putin Will Teach You To Love Your Motherland, about "political repression in Russia".
She tweeted that the authorities used "force" during the detentions near a ferry terminal about 30km (20 miles) north of the seaside Olympic venues.
HooliganismMs Tolokonnikova also claimed that since their arrival, they had been detained several times. She described Sochi as a "police town".
Local human rights activist Semyon Simonov told the Associated Press news agency that he was with the two women when they were stopped and accused of theft.
Mr Simonov said that several other activists were also detained by police at the same time. He said that the women were being held at a police station in Adler, a suburb of Sochi where the Olympic Park is located.
Ms Alyokhina and Ms Tolokonnikova were convicted of hooliganism after staging a protest in Moscow's largest cathedral in 2012 in opposition to President Vladimir Putin's government.
Earlier this month, six members of Pussy Riot signed an open letter insisting that the two should no longer be described as members of the punk rock collective.
The remaining members of the group said the pair had forgotten about the "aspirations and ideals of our group" and were wrong to appear at an Amnesty International concert in New York.
In a separate development, the International Olympic Committee on Tuesday defended the removal of a transgender Italian gay rights activist from an Olympics arena, arguing that she was "escorted peacefully" from the premises and not detained.
Former Italian MP Vladimir Luxuria - dressed in rainbow colours - was taken away by four unidentified men in a car with Olympic markings as she tried to enter an arena Monday night for a women's hockey game.