The factual history says at least Boumedien (I haven't checked the others) was picked up in Bosnia, after the Bosnian courts found insufficient evidence to hold them. The judge looked at the US government's evidence, a classified document from an unnamed source.
That secret document, which the judge said he could not evaluate for credibility or corroboration because the government had not given him information enabling him to do so, did not convince him that the five had a plan to fight against the U.S. or its allies, or even knew of such a plan.
SCOTUSblog: Judge orders five detainees freed
Yes and the five are going back to Bosnia, which has already stated that it will take them. The judge, appointed by Bush and who has already upheld some Bush provisions over detention, said that they could not be held because there was only the testimony of one anonymous person against them.
If the entire DoD couldn’t find any more evidence against them after seven frickin’ years, then perhaps the entire case against these guys was bogus from the get-go. Or the DoD is not handling business the way it should.