NEW : Bruce Ivins ' lawyers say documents , statements are n't `` concrete evidence '' Federal prosecutor says Ivins acted alone in attacks that killed five . Score: 6 Justice Department releases hundreds of pages to public .
NEW : Bruce Ivins ' lawyers say documents , statements are n't `` concrete evidence '' Federal prosecutor says Ivins acted alone in attacks that killed five . Records say Ivins tried to mislead feds with false samples of bacteria . Justice Department releases hundreds of pages to public .