The head of the Russian security service, FSB, said they have identified "several suspects" in the murder of opposition politician Boris Nemtsov, according to the TASS news agency.
Open Kremlin critic Nemtsov, aged 55, was shot four times in the back as he crossed a bridge in Moscow last week.
Thousands of people attended his funeral yesterday.
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.