Media playback is unsupported on your device

Why did Boston bomber hate the US?

5 August 2013 Last updated at 06:11 BST

One of the brothers suspected of carrying out the Boston bombings subscribed to radical right wing American literature about guns, government conspiracy theories and white supremacy.

The BBC's Panorama programme has learnt that Tamerlan Tsarnaev was reading right wing material before the attack.

It could challenge the perception of the brothers as straightforward radical jihadists.

Hilary Andersson reports.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.