This is an image of the teen age "Black Widow" suicide bomber thought to be responsible for this week's Russian underground bombings posing with her dead militant rebel husband. The bomber was Dzhennet Abdurakhmanova, a 17-year-old widow of a Dagestani Islamist rebel killed in 2009, Umalat Magomedov, Russian media reported, cf. http://www.thesun.co.uk/sol/homepage/news/2918482/Baby-faced-teen-is-train-bomber.html#ixzz0jxRktz9a
Chechnya is predominantly Muslim. Most of the Chechens belong to the Shafi`i school of thought of Sunni Islam.
CNN's Atika Shubert looks at a possible Chechen connection to attacks in Russia, including twin subway blasts.