A leading Russian newspaper says one of the Moscow subway suicide bombers was the 17-year-old Muslim widow of a slain Islamist rebel from the North Caucasus.
Monday's bombings killed 39 people and injured about 90 in attacks that the security chief blamed on unnamed militants from the volatile southern region.
The Kommersant on Friday published a photograph of a young woman dressed in a black Muslim headscarf and holding a pistol. It names her as Dzhennet Abdurakhmanova from Dagestan.
A man with his arm around her, also holding a gun, is identified as Umalat Magomedov, whom the paper describes as an Islamist miltitant leader killed by government forces in December.
The report, giving no sources, identified the second bomber as 20-year-old Markha Ustarkhanova from Chechnya.