Transmitted: 11/2/95 1:02 AM (tm00hd06) By Gary Marx and John O'Brien Tribune Staff Writers Copyright Chicago Tribune (c) 1995 From the start, authorities believed the crude bomb mailed to a federal judge was the work of a man locked up in an Illinois prison, though they assumed that someone on the outside had actually built and mailed the bomb for him. On Wednesday, investigators revealed something startling: They believe there was no accomplice. The convict apparently built the bomb in his cell at Stateville Correctional Center near Joliet, using materials readily available to someone doing hard time. He then wrapped the device, addressed it to U.S. District Judge Blanche Manning, wrote "legal and confidential" on the package and simply dropped it into the prison mail and it was delivered Tuesday, authorities said. An X-ray machine used to inspect mail at the prison did not detect the device, but a similar machine at the Dirksen Federal Building did. ............................ Howell said prison records show that Saunders mailed a package to Manning on Saturday. Prison officials routinely open and read all mail entering and leaving the prison, but Saunders' package wasn't opened because he indicated on the envelope that it was material relating to a legal matter--something that is protected by law from regular search by prison officials. Instead, the package was passed through an X-ray machine, but the bomb was not detected. ------------------------ This excerpt was obtained from the Chicago Tribune's archives in the Newstand section of AMERICA ONLINE (aol.com). For more information about the Tribune's aol.com services, contact: TribLetter@aol.com Additional information about Chicago Tribune electronic resources can be found on page 2 of the daily Tribune.