Washington — Administration officials are preparing long-range plans for indefinitely imprisoning suspected terrorists whom they do not want to set free or turn over to courts in the United States or other countries, according to intelligence, defense and diplomatic officials.

The Pentagon and the CIA have asked the White House to decide on a more permanent approach for potentially lifetime detentions, including for hundreds of people now in military and CIA custody whom the government does not have enough evidence to charge in courts. The outcome of the review, which also involves the State Department, would also affect those expected to be captured in the course of future counterterrorism operations.

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One proposal under review is the transfer of large numbers of Afghan, Saudi and Yemeni detainees from the military’s Guantanamo Bay, Cuba, detention center into new U.S.-built prisons in their home countries. The prisons would be operated by those countries, but the State Department, where this idea originated, would ask them to abide by recognized human rights standards and would monitor compliance, the senior administration official said.

As part of a solution, the Defense Department, which holds 500 prisoners at Guantanamo Bay, plans to ask Congress for $25 million to build a 200-bed prison to hold detainees who are unlikely to ever go through a military tribunal for lack of evidence, according to defense officials.

The new prison, called Camp 6, would allow inmates more comfort and freedom than they have now and would be designed for prisoners who the government believes have no more intelligence to share, the officials said. It would be modeled on a U.S. prison and would allow socializing among inmates.

"Since global war on terror is a long-term effort, it makes sense for us to be looking at solutions for long-term problems," said Bryan Whitman, a Pentagon spokesman. "This has been evolutionary, but we are at a point in time where we have to say, ‘How do you deal with them in the long term?’ ”

The administration considers its toughest detention problem to involve the prisoners held by the CIA. The CIA has been scurrying since Sept. 11, 2001, to find secure locations abroad where it could detain and interrogate captives without risk of discovery and without having to give them access to legal proceedings.

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The CIA is believed to be holding fewer than three dozen al-Qa’ida leaders in prison. The agency holds most if not all of the top captured al-Qa’ida leaders, including Khalid Sheik Mohammed, Ramzi Binalshibh, Abu Zubaida and the lead Southeast Asia terrorist, Nurjaman Riduan Isamuddin, known as Hambali.

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The CIA had floated a proposal to build an isolated prison with the intent of keeping it secret, one intelligence official said. That was dismissed immediately as impractical.

One approach used by the CIA has been to transfer captives it picks up abroad to third countries willing to hold them indefinitely and without public proceedings. The transfers, called "renditions," depend on arrangements between the United States and other countries, such as Egypt, Jordan and Afghanistan, that agree to have local security services hold certain terror suspects in their facilities for interrogation by CIA and foreign liaison officers.

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"Renditions are the most effective way to hold people," said Rohan Gunaratna, author of "Inside al-Qa’ida: Global Network of Terror." "The threat of sending someone to one of these countries is very important. In Europe, the custodial interrogations have yielded almost nothing" because they do not use the threat of sending detainees to countries where they are likely to be tortured.