That's about 5 percent of the 540 terror suspects released from the prison. Another 9 percent of freed Guantanamo detainees are suspected to have rejoined the terror activity. That's 74 detainees in all.
"What this tells us is, at the end of the day, there are individuals, that if released, will again return to terrorist activities," Pentagon spokesman Bryan Whitman said Tuesday.
Some constitutional lawyers have disputed the data because it is not specific about the evidence used to track the detainees.
Speaking out against the United States, or participating in other anti-U.S. propaganda alone is not considered terrorist activity, the Pentagon said.
The Associated Press contributed to this report.