A leading Russian newspaper says one of the Moscow subway suicide bombers was the 17-year-old widow of a slain Islamist rebel from the North Caucasus.

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 said was an Islamist militant leader killed by government forces in December.

The report, giving no sources, identified the second bomber as 20-year-old woman from Chechnya.

Russian officials have not confirmed the report.

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