One of the brothers suspected of carrying out the Boston bombings was in possession of right-wing American literature in the run-up to the attack, BBC Panorama has learnt.
Tamerlan Tsarnaev subscribed to publications espousing white supremacy and government conspiracy theories.
He also had reading material on mass killings.
Until now the Tsarnaev brothers were widely perceived as just self-styled radical jihadists.
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