MOSCOW: Russian investigators are expected to indict five men with the murder of opposition leader Boris Nemtsov, a brazen killing which sent shockwaves among the opposition earlier this year.

Nemtsov, a top opponent of Russian President Vladimir Putin, was shot late at night on February 27 as he was walking just outside the Kremlin. Five Chechen men have been arrested on charges of involvement in the killing, but it has remained unclear who ordered the attack.

The Investigative Committee, Russia's top investigative body, said in a statement that investigators would file the final indictment against the five men later on Tuesday. The committee said they are expecting the probe to wrap up in January.