NEW : Bruce Ivins ' lawyers say documents , documents are n't ` ` concrete . '' Taylor said Ivins committed suicide last week as federal prosecutors prepared for a meeting with his lawyers to lay out the findings . Federal prosecutor says Ivins acted alone in attacks that killed people . Police say Ivins tried to provide investigators with false samples of bacteria . Justice Department releases hundreds of pages to public .
NEW : Bruce Ivins ' lawyers say documents , documents are n't ` ` concrete . '' Federal prosecutor says Ivins acted alone in attacks that killed people . Police say Ivins tried to provide investigators with false samples of bacteria . Justice Department releases hundreds of pages to public .