A Moscow court has charged two men in connection with the murder of Russian top opposition leader Boris Nemtsov.
It said one of the men, Zaur Dadayev, had admitted involvement in the shooting on a bridge near the Kremlin on 27 February.
He and the other accused, Anzor Gubashev, are of Chechen origin.
Three other suspects were remanded in custody. A sixth man is reported to have killed himself in a standoff with police in the Chechen capital Grozny.
The suspect threw one grenade at the arresting officers and blew himself up with another, a security source told Interfax news agency.
Nemtsov, a former deputy prime minister and Russia's top opposition leader, who was 55, was shot in the back four times as he was walking with his girlfriend near the Kremlin. He was buried in Moscow March 3.