The Justice Department announced Thursday it has ended its investigation into CIA interrogations of terrorist detainees without bringing criminal charges.

The decision in the probes of the deaths of two terrorist suspects marks the end of a wide-ranging criminal investigation by federal prosecutor John Durham into interrogation practices during the presidency of George W. Bush.

Durham has looked into the treatment of 101 detainees in U.S. custody since the Sept. 11, 2001, terrorist attacks.

Durham’s probe into another episode involving the CIA began in January 2008 when the Justice Department chose him to conduct a criminal investigation into the agency’s destruction of videotapes it had made of its interrogations of terrorist suspects.

In August 2009, Attorney General Eric Holder expanded Durham’s mandate to include a preliminary review of the CIA’s interrogation of specific detainees overseas. In June 2011, Holder approved Durham’s request to move into a full criminal investigation of the two deaths.

The 2009 expansion followed the public release of an internal CIA inspector general’s report that revealed agency interrogators once threatened to kill a Sept. 11 suspect’s children and suggested another would be forced to watch his mother be sexually assaulted. The report said some CIA interrogators went beyond Bush administration restrictions that gave them wide latitude to use severe tactics such as waterboarding, a simulated drowning technique.

In regard to the just-completed probe of the two detainees’ deaths, Holder said that “based on the fully developed factual record concerning the two deaths, the department has declined prosecution because the admissible evidence would not be sufficient to obtain and sustain a conviction beyond a reasonable doubt.”

In a message to employees Thursday, CIA Director David Petraeus said that “as intelligence officers, our inclination, of course, is to look ahead to the challenges of the future rather than backwards at those of the past. Nonetheless, it was very important that we supported fully the Justice Department in its efforts” and “I would like to thank everyone who played a role” in doing so.

Former CIA Director Michael Hayden said he was “heartened that the investigation is complete, and I’m heartened by the results. I had great confidence in Mr. Durham. I just regret that many CIA officers had to go through yet another review of these activities.”

Jameel Jaffer, deputy legal director of the American Civil Liberties Union, called the outcome of the investigation “nothing short of a scandal.”

“Continuing impunity threatens to undermine the universally recognized prohibition on torture and other abusive treatment,” Jaffer said.

Durham’s review examined whether CIA interrogators used any unauthorized interrogation techniques, and if so, whether the techniques could constitute violations of the torture statute or any other laws. The approach taken in the probe was not to prosecute anyone who acted in good faith and within the scope of the legal guidance given by the Justice Department’s Office of Legal Counsel regarding the interrogation of detainees.

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