The Moscow apartments of opposition activists Aleksandr Averin and Sergei Fomchenkov have been searched by police, RFE/RL's Russian Service reports.
Fomchenkov and another opposition activist, Margarita Filippova, were detained when police searched Fomchenkov's apartment on December 9.
The police confiscated materials on human rights violations.
Averin and Fomchenkov are executive committee members of the opposition coalition Other Russia and are on the election committee that supports Eduard Limonov, a leader of Other Russia who plans to take part in the 2012 presidential election. Filippova is a member of the National Assembly group.
Averin told RFE/RL that police searched his apartment for about two hours on December 9 and confiscated his computer's hard drive and Limonov campaign literature.
Averin said the search by police may have been a "warning" from officials as the coalition prepares for a December 31 protest in Moscow.
Limonov told RFE/RL that unless the authorities give a full explanation for their actions the opposition will consider the search "an act of repressive lawlessness."