<p>Radical Islamic materials and an al Qaeda magazine were found on the computer of Boston Marathon bomber Tamerlan Tsarnaev’s widow — and there was explosive residue throughout their house, it was revealed yesterday.</p>
<p>The files found on Katherine Russell’s hard drive are part of an investigation into whether the woman — who claimed to be in the dark on her husband’s terrorist activities — was aware of his plan to set off the two bombs, The Washington Post reported.</p>
