Boston - Boston Marathon bombing suspect Dzhokhar Tsarnaev has told investigators his older brother Tamerlan was the driving force behind last week's attack and that no international terrorist groups were behind them. CNN reports that Dzhokhar, wounded and held in a Boston hospital, said his brother - who was killed on Friday - wanted to defend Islam from attack. A government source cautioned that the interviews were preliminary, and that Tsarnaev's account needed to be verified by investigators. The 19-year-old has been charged with using and conspiring to use a weapon of mass destruction, and one count of malicious destruction of property. Tsarnaev communicated mostly by nodding his head.

CNN