Two suspects have been detained over the murder of Russian opposition leader Boris Nemtsov, the Interfax news agency reports, citing the head of the country's federal security service.
Open Kremlin critic Nemtsov, 55, was shot four times in the back as he crossed a bridge in Moscow last week.
Skepticism surrounds the suspects arrested in the Kremlin-led investigation into the death of Russian politician Boris Nemstov.
The mother of murdered Boris Nemstov's girlfriend is worried her daughter is being treated as if she had something to do with the killing.
The death of Boris Nemtsov hits particularly hard because he represented what post-Communist Russia might have become.