WASHINGTON — The United States cannot consistently ensure that former Guantanamo Bay detainees will not engage in militant activity once they are released from the military prison or transferred to a third country, a new congressional report found Thursday.
The report from the Oversight and Investigations Subcommittee of the House Armed Services Committee examined efforts by the Obama and Bush administrations to move detainees from the military prison in Cuba, which has held 779 prisoners since it opened in the wake of the September 11, 2001, attacks.
According to an unclassified version of the report obtained by Reuters, some 27 percent of the 600 former detainees who were moved out of Guantanamo had been "confirmed or suspected to be presently or previously engaged in terrorist activities."
Over the years, detainees have been transferred to countries such as Afghanistan, Saudi Arabia, Pakistan, Yemen, Spain and Denmark.
"The Bush and Obama administrations, reacting to domestic political pressures and a desire to earn goodwill abroad, sought to reduce the Guantanamo population by sending detainees elsewhere," it said.
"Both administrations faced the persistent challenge of ensuring that the potential threat posed by each detainee had been aptly assessed before transfer or release, and that the countries that received the detainees had the capacity and willingness to handle them in a way that sufficiently recognized the dangers involved," it added.
"Despite earnest and well-meaning efforts by officials in both administrations, the re-engagement rate suggests failures in one or both aspects of the process," it said.
The report said that evaluating detainees and ensuring their cases were handled "appropriately" by receiving countries "was, and remains, a challenge."
As of Jan. 1, 779 individuals have been held at Guantanamo, 600 have left the installation, eight died there and 171 remain, the report said, citing the Defense Department.
According to the report, five of 66 detainees who left Gitmo in the 20 months between February 2009 and October 2010 are confirmed (two) or suspected (three) by the intelligence community of involvement in terrorist or insurgent activities, or a 7.5 percent re-engagement rate.
It recommended that the Obama administration produce a study on Guantanamo detainees' recidivism and provide Congress with an analysis of how well countries that have or might receive detainees can manage such individuals.
The Committee Chairman, Rep. Buck McKeon, R-Calif., said in a statement obtained by NBC News that the report is proof that detainee release policies need to change.
"It appears that, despite well intentioned and sincere efforts by government officials, our detainee release policy could be unnecessarily risky and potentially harmful to U.S. national security," McKeon said. "We must do a better job addressing the problems with detainees releases and reengagement concerns."
"We have great reservations about releasing detainees because of the clear evidence that they end up back on the battlefield," House Speaker John Boehner, a Republican, told reporters at a news conference.
The report is one more indication of the struggle that President Barack Obama has faced in his efforts to shut down the controversial military prison, which has been a flashpoint for worldwide criticism of the U.S. response to terrorism.
It also comes as the White House considers transferring five senior Taliban officials to Qatar as part of its efforts to broker a peace deal in Afghanistan, another idea that has already generated significant pushback from Congress.
No detainees have been transferred out of Guantanamo since January 2011, in large part because of congressional restrictions. Congress has also voted repeatedly to limit transfer of detainees to the United States for trial.Video: Exclusive: Lakhdar Boumediene, former Guantanamo detainee (on this page)
Late last year, lawmakers also imposed additional transfer restrictions in a defense authorization bill.
While the report, headed by the Republican subcommittee chair, Robert Wittman, was originally conceived of as a bipartisan effort, committee Democrats issued a lengthy dissent that disagreed with much of its findings.
They accused Republicans of fear-mongering for political gain, ahead of November's election that Democrat Obama hopes will give him a second term.Slideshow: Life goes on in Guantanamo (on this page)
"The Armed Services Committee is not accustomed, and should not lower itself, to wearing blinders, dumbing down information, and hinting darkly, all in order to attempt a partisan advantage," Representative Jim Cooper, the top Democrat on the subcommittee, said in a statement.
Democrats also disputed the report's assertion that more than a quarter of former Guantanamo prisoners were possible militants, saying the true figure was far lower.
Last week, the Defense Department said that as of December 2010, 14 percent of the nearly 600 detainees who had left Guantanamo were confirmed of later taking part in militant activity, and 12 percent were suspected of such activity.
Democrats also said the report failed to consider adequately the national security risks the United States caused by keeping detainees at Guantanamo without trial.
Reuters and The Associated Press contributed to this report.