The comment, on a video titled (in Russian), "How I accepted Islam and became a Shiite," questions the narrator's conversion. "You accepted Shiism not because it coninced you, but because of your own...interests (of which only Allah knows), which you followed. As you walked into Islam you also flew out of it. You let yourself down, Misha. Alright, goodbye," Tsarnaev wrote.

Chechen militants, and many of the Arab militants who backed htem, are typically Sunni Muslims.