Two former members of the all-female Russian punk band Pussy Riot were detained in central Sochi on Tuesday, the husband of a member told CNN.
Maria Alyokhina and Nadezhda Tolokonnikova were recently released from prison, ahead of the Sochi Olympics.
The two were near the seaport, meeting journalists, when police took them in, Tolokonnikova's husband said.
Local police have not yet confirmed the detention.
The pair was planning to record a song in English called "Putin will teach you love the homeland."
Tolokonnikova posted photos to Twitter of what she claims is herself in a car being taken to a police station.
Alyokhina posted a tweet saying they had had been detained near the church of Mikhail the Archangel and were accused of committing a crime. Officers forced them into a police van, she said.
Tolokonnikova and Alyokhina, who are highly critical of President Vladimir Putin, went to Sochi to protest against the lack freedom of speech in Russia.
The former band members were thrown in jail for nearly two years after they were convicted of "hooliganism" and inciting religious hatred for performing a riotous punk song slamming Putin in a Moscow Cathedral -- and posting a video of it online.
A third member of Pussy Riot, Yekaterina Samutsevich, was released in 2012.
In February, other members of the band distanced themselves from Tolokonnikova and Alyokhina.