Mannings computer downloaded the Afghan war logs used by Wikileaks

WSJ:

Investigators have found concrete evidence linking Pfc. Bradley Manning with the leak of classified Afghanistan war reports, a defense official said.

A search of the computers used by Pfc. Manning yielded evidence he had downloaded the Afghanistan war logs, which span from 2004 until 2009, the official said. It's not clear precisely what that evidence is.

The investigation is also looking at who might have helped Pfc. Manning provide the documents to WikiLeaks, a web-based group that earlier this week released 76,000 secret reports from Afghanistan.
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Because of the focus on civilians who helped Pfc. Manning, the Federal Bureau of Investigation and the Justice Department have been brought into aid the investigation lead by the Army Criminal Investigation Command.

Defense officials are also combing through Pfc. Manning's computers in a bid to figure out what other material he may have stolen as they try to anticipate what other material WikiLeaks may have.

WikiLeaks says it has at least 15,000 more Afghanistan documents the group withheld until some details could be redacted.

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Almost immediately after the release of the documents, investigators began focusing on Pfc. Manning, who had suggested to a former hacker he had obtained access to a similar cache of war logs from Iraq.

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There is more.

This guy was caught when he bragged to another guy in an email that he had sent material to WikiLeaks. He is currently in custody charged with releasing a video to WikiLeaks earlier. I suspect his lawyer will have additional things to worry about soon.