The US military has begun notifying the Red Cross of the identities of terror suspects being held at secret camps in Iraq and Afghanistan, US reports say.
The International Committee of the Red Cross would not comment on the report, which the New York Times carried quoting unnamed US officials.
The policy reportedly took effect this month with no public announcement.
Correspondents say that, if confirmed, the move represents a victory for human rights groups.
Citing three senior military officials, the New York Times said the policy would give the Red Cross access to dozens of suspected foreign fighters captured in Iraq and Afghanistan.
They are being held at so-called "temporary screening camps" run by US special forces at secret locations in Balad in Iraq, and Bagram in Afghanistan.
The Pentagon has previously said that providing information about these detainees could jeopardize counter-terrorism efforts.
It has refused to comment on the latest reports.
This week, the detention policies of the former Bush administration are likely to come under further scrutiny with the publication of a CIA report dating from 2004 into its interrogation practices at that time.