caliphate. he advised terrorists in yemen and africa. not to waste time on an islamic state, but instead, he was obsessed with attacking the united states and its interests. tom foreman takes a look. >> reporter: christine, this really is a remarkable collection of documents. you get a full picture of the man who has been mythical here as an enemy of the united states. we do know from the documents that he actually sent people to great britain and europe and russia to carry out attacks specifically to try to hit american targets if possible. and numerous attacks failed. they did to the materialize. when he responded to the letters to others he said it was bad luck and god wasn't on our side. beyond that though he felt a great disdain for american targets out there. he pushes people to say, look don't attack the security forces or police forces where you are.