WASHINGTON, Feb. 19 (UPI) -- An investigation into 2001 anthrax attacks that killed five people is formally over, representatives of the U.S. Justice Department and the FBI said Friday.
Seventeen others were sickened during the attacks.
FBI and Justice Department officials provided a 92-page investigative summary and documentation for survivors of the attacks, relatives of the victims and congressional committees, the Justice Department said.
The "Amerithax" investigation was the largest investigation into a bioweapons attack in U.S. history, the Justice Department said.
The investigation concluded that Dr. Bruce Ivins, a U.S. Army researcher, acted alone in planning and executing the attacks, officials said. Ivins died in 2008 before any charges were filed against him.
The summary was posted on the Justice Department Web site at www.usdoj.gov/amerithax.