Two more murder suspects have been detained by police in Russia over the death of vocal Kremlin critic Boris Nemtsov, Agence France-Presse reports.
The men, reportedly both from the Chechnya region, are being questioned alongside two others arrested yesterday.
Former Prime Minister Nemtsov, aged 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.