Ala. prof won’t be charged in 1993 Mass. mail bomb

BOSTON (AP) — A former professor accused of killing three colleagues in a shooting rampage in Alabama earlier this year won’t be charged in an attempted mail-bombing in Massachusetts 17 years ago.

The chief federal prosecutor in Boston said the initial investigation into two pipe bombs that were mailed to a scientist in 1993 was “appropriate and thorough.” The case has never been solved.

Amy Bishop was charged in February with the University of Alabama-Huntsville shootings and in June with her brother’s 1986 killing in Massachusetts. She and her husband were questioned about the 1993 pipe bombs, but were never charged.

Dr. Paul Rosenberg had received the bombs shortly after Bishop left her job as a researcher at Children’s Hospital in Boston, partly due to a poor review by Rosenberg. They did not detonate.

U.S. Attorney Carmen Ortiz decided to review the investigation after Bishop was charged with the Alabama shootings.

“This office and the investigative agencies assigned to the matter engaged in extensive efforts to determine the source of the incendiary device, but, despite those efforts, were unable to gather sufficient evidence to bring charges,” Ortiz said in a statement Thursday. “As a result, the matter was closed.”