Rebel fighter William Plotnikov reads the Koran in this undated photo released by Dagestani branch of the Russian Federal Security Service.

The hunt for who or what radicalised alleged Boston bomber Tamerlan Tsarnaev is focussing on two young men wh(...)

Tamerlan Tsarnaev, left, and his brother Dzhokhar Tsarnaev. US agencies are investigating whether Tamerlan Tsarnaev met radical Muslim militants on a six-month trip to the Russian region of Dagestan last year. Photograph: AP Photo

The Russian authorities have been “very co-operative” with the United States since the Boston marathon bombings just over two weeks ago, Presid(...)