Alleged mastermind of deadly Moscow blasts tied to global terrorists - FSB
The evidence was found after Magomedali Vagabov was killed in a special operation in Dagestan last week.
The FSB hasn't ruled out publishing the documents.
Vagabov was thought to have planned the deadly twin blasts in Moscow in March that killed 40 and injured over one hundred.
He has been on the federal and international wanted list for over two years.