In an e-mail response to questions on Saturday, an American military spokesman, Col. Thomas W. Collins, said the military was certain that American forces were not involved in any of the deaths in the Nerkh district. The results of internal investigations have not been made public, though. Afghan military investigators insist that the American military at the very least had to have been aware of abuses of suspected insurgent detainees being carried out at the base. The Afghan investigators also say they have proof that at least one Afghan on the base was involved.

Ataullah Khogyani, the spokesman for the governor of Wardak Province, confirmed that four more bodies had been uncovered and identified by their relatives as being among the missing, but he said their identities had not yet been verified by forensic investigators. “According to local officials, the bodies were recovered some 150 to 200 meters from the outer wall of the base,” he said. At least three other victims’ bodies were previously found close to the base.

The disappearances in Nerkh led to a strain in relations between the Afghan government and the American military, especially after the Afghan authorities demanded that the Special Forces hand over a man named Zakaria Kandahari. The Afghans identified Mr. Kandahari as responsible for the torture and killing of many of the victims, but the Americans maintained he was a low-level interpreter. Afghan officials said he was an Afghan-American citizen, and they accused the American military of helping him escape. American officials say Mr. Kandahari, who they insist was not an American citizen, fled on his own.

Mr. Naimatullah, 35, said that his two brothers, Sediqullah, 28, and Estmatullah, 25, disappeared after a raid on their house during a roundup of men from the village of Amer Kheil on Nov. 20 and were seen being taken by the Special Forces A Team into the base. He said the American military later told him they did not have the young men in custody.

After villagers found the two other bodies on Thursday, about 60 locals began digging in earnest around the perimeter of the base, now occupied by an Afghan Special Forces unit. (The American military withdrew the A Team as the Afghan president, Hamid Karzai, had insisted.)