US war in Iraq and Afghanistan motivated Boston bombers: report

UsDzhokhar Tsarnaev, has been communicating with federal authorities in a limited fashion. (Reuters)

Dzhokhar told investigators the attack was devised from the Internet, ABC news reported. Republican Senator Marco Rubio made a similar statement after a classified FBI briefing.

"The increasing signals are that these were individuals who were radicalised, especially the older brother, over a period of time - radicalized by Islamist fundamentalist terrorists, basically using Internet sources to gain not just the types of philosophical beliefs that radicalized them, but also learning components of how to do these sorts of things," Rubio told reporters.

"This is a new element of terrorism that we have to face in our country. We need to be prepared for Boston-type attacks, not just 9/11-type attacks," he said.

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