Boston bomb suspects 'radicalised by Web'

New details have emerged about how the two Boston Marathon bombing suspects may have been swayed by a radical, anti-American strain of Islam.

Republican Senator Richard Burr said after the Senate Intelligence Committee was briefed by federal law enforcement officials that there was “no question” that older brother Tamerlan Tsarnaev was “the dominant force” behind the attacks, and that the brothers were apparently radicalised by material on the internet rather than by contact with militant groups overseas.