WASHINGTON - Obama administration officials said Friday they had no grounds to investigate the 2001 deaths of Taliban prisoners of war who human rights groups allege were killed by U.S.-backed forces.

The mass deaths were brought up anew Friday in a report by The New York Times on its Web site. It quoted government and human rights officials accusing the Bush administration of failing to investigate the executions of hundreds, and perhaps thousands, of prisoners.

U.S. officials said Friday they did not have legal grounds to investigate the deaths because only foreigners were involved and the alleged killings occurred in a foreign country.

The Times cited U.S. military and CIA ties to Afghan Gen. Abdul Rashid Dostum, whom human rights groups accuse of ordering the killings. The newspaper said the Defense Department and FBI never fully investigated the incident.

Asked about the report, Marine Corps Col. David Lapan, a Pentagon spokesman, said that since U.S. military forces were not involved in the killings, there is nothing the Defense Department could investigate.

"There is no indication that U.S. military forces were there, or involved, or had any knowledge of this," Lapan said. "So there was not a full investigation conducted because there was no evidence that there was anything from a DoD (Department of Defense) perspective to investigate."

A Justice Department official said the FBI had no jurisdiction to investigate. The official was not authorized to discuss the matter publicly and spoke on condition of anonymity. Separately, Justice Department spokesman Matthew Miller declined to comment.

A spokesman for former President George W. Bush did not have an immediate comment Friday night.

The allegations date back to November 2001, when as many as 2,000 Taliban prisoners died in transit after surrendering during one of the regime's last stands, according to a State Department report from 2002.

Witnesses have claimed that forces with the U.S.-allied Northern Alliance placed the prisoners in sealed cargo containers over the two-day voyage to Sheberghan Prison, suffocating them and then burying them en masse using bulldozers to move the bodies, according to the State Department report. Some Northern Alliance soldiers have said that some of their troops opened fire on the containers, killing those within.

Dostum, the Northern Alliance general who is accused of overseeing the atrocities, has previously denied the allegations.

A former U.S. ambassador for war crimes issues, Pierre Prosper, told the Times that the Bush administration was reluctant to investigate the deaths, even though Dostum was on the payroll of the CIA and his soldiers worked with U.S. special forces in 2001.

Dostum was suspended from his military post last year on suspicion of threatening a political rival, but Afghan President Hamid Karzai recently rehired him, the Times reported.

Reacting to the Times' report, human rights group Physicians for Human Rights called for the Justice Department to begin a criminal investigation into whether the Bush administration blocked inquiries into the Taliban deaths.

Nathaniel Raymond, the group's lead researcher into the deaths, said President Barack Obama "must open a full and transparent criminal probe and prosecute any U.S. officials found to have broken the law."