Allegations that a U.S. soldier suspected of killing 17 Afghan civilians briefly returned to his base in the midst of the attacks are among the developments that have surfaced in the case in recent days.
U.S. Army Staff Sgt. Robert Bales, 38, is accused of walking into two villages near an Army outpost in Kandahar provinceâ€™s Panjwai district and killing men, women and children on March 11. U.S. authorities have said Bales acted alone, leaving at night and eventually surrendering at his base.
The U.S. military has charged Bales with 17 counts of murder with premeditation, for which he could face the death penalty. He also faces six counts of attempted murder and two counts of assault and is being held at Fort Leavenworth, Kansas, after being flown from Afghanistan a few days after the killings.
Here are some of the new developments in the case this week:
U.S. official: Bales left base twice, alleged to have talked of killings
Two senior U.S. officials told CNN that Bales sneaked off his remote outpost twice during his alleged rampage, entering one village during each trip.
One U.S. official with knowledge of the investigation said an Afghan guard allegedly spotted Bales leaving his outpost around 1 a.m. It is not clear why Bales' superiors werenâ€™t alerted, and the official said Bales was not noticed when he allegedly returned to the compound an hour later.
During the roughly 30 minutes when he was on the base, he woke at least one roommate and claimed he had been killing Afghan civilians off the base, which his roommate dismissed as nonsense, the official said, according to CNNâ€™s Nick Paton Walsh.
The official said a different Afghan guard saw Bales leave the base a second time. He alerted his command that someone had left the outpost, and U.S. troops formed a search party, according to the official.
About 3:30 a.m., the official said, a surveillance camera spotted Bales returning to the base, and the search team found him just outside the compound.
The U.S. official said Bales was supposed to have been on duty guarding the base that night and would have had full body armor and weaponry as standard.
Balesâ€™ attorney, John Henry Browne, who has said the prosecutionâ€™s case will be difficult to prove, told CNN that the account of Bales leaving twice â€śis an allegation.â€ť
â€śItâ€™s certainly not proof of anything,â€ť Browne said. â€śAnd obviously â€¦ I canâ€™t tell you what my client remembers or (doesnâ€™t) remember, other than telling you that he has some memory problems about everything that happened that night.â€ť
Motive for killings unclear
U.S. officials havenâ€™t suggested any motive in the slayings. Bales has maintained his silence on the killings, the U.S. official with knowledge of the investigation said.
An Afghan general charged with leading Afghanistanâ€™s investigation into the killings told Yalda Hakim, the Australian reporter, that villagers have alleged that Bales was upset over an injury to a U.S. colleague.
In response to these suggestions, the U.S. official said that a soldier at the base had lost a leg in an explosion three or four days earlier, but that there was no reason to believe Bales had been present at the scene of that blast.
The official said he did not think alcohol had fueled the crime. "I do not think that drinking played a big role, but there may have been some level of drinking," the official said.
Villagers say there was more than one attacker
The U.S. military says there is no evidence that more than one man was involved in the shootings. But Australian reporter Hakim - the first Western journalist to visit the scene - said some survivors and relatives of survivors told her that they believe more than one U.S. soldier was present when the killings took place. Others speak of seeing a single American soldier leaving the camp that night.
One 8-year-old girl, who said she saw her father killed, told Hakim that there were other men with the gunman, â€śstanding in the yard, holding lights.â€ť
Mohammed Wazir, a man whose relatives were killed, told CNN he doubts the massacre was the act of a single man.
"The Americans insist there was one killer, but we insist there was more than one," he said. "The Americans should stop lying. They should confess what the reality and truth is. We want justice to be done. We want it from God."
U.S. pays families of victims; body count unclear
Over the weekend, the U.S. government paid a total of $860,000 to the families of victims, Afghan officials said - $50,000 for each of 16 dead, and $10,000 for each of six wounded.
On Monday, two men whose relatives were killed told CNN they refused the money.
"We want justice. We want our courts to make the decision, so the people who are involved are prosecuted. This happened in Afghanistan and we lost our family members here in Afghanistan, so we want these people to be prosecuted in front of us, so we can watch them while they are being hanged," said Mohammed Wazir.
But the governor of Kandahar, Tooryalai Wesa, said all four families who lost relatives on March 11 sent representatives to the meeting and accepted money.
The dead have been identified as Mohammad Dawood Abdullah, Khudaidad Mohmmad Jama, Nazar Mohammad Taj Mohammad, Payendo, Robina, Sahtarina Sultan Mohammad, Zuhra Abdul Hameed, Nazia Doost Mohammad, Mosooma Mohammad Wazir, Farida Mohammad Wazir, Palwasha Mohammad Wazir, Nabia Mohammad Wazir, Asmatullah Mohammad Wazir, Faizullah Mohammad Wazir, Esa Mohammad Mohammad Husain and Akhtar Mohammad Murad Ali.
The number of victims has been a source of confusion. Afghan officials initially said there were 16 fatalities, but U.S. military prosecutors charged Bales with killing 17.Â The charge sheet listed four women among 17 victims, while initial U.S. and Afghan reports listed three women among 16 dead.
A NATO spokesman, Col. Gary Kolb, said last week that investigators felt they had evidence to charge Bales with 17 counts of murder.
Gen. John Allen, the American commander of the International Security Assistance Force-Afghanistan, put the number of dead at 17.
"We should not be surprised, as the investigation went forward, that an additional number was added to that (original 16)," Allen told reporters Monday at the Pentagon. "As the investigation goes forward, we'll get greater clarity on that."
Questions surround legal process for Bales
Afghans are insisting that Bales be returned to Afghanistan to face trial, with villagers and lawmakers questioning the U.S. military's account of what happened. But a military official in Afghanistan has said that Bales will face military justice in the United States.
Bales could face the death penalty if convicted of any of the murder counts against him.
If and when the case comes to trial, Bales' lawyer, John Henry Browne, said, it is going to be "extremely difficult" for the prosecution.
"They have no murder scene, no forensics," Browne said outside his Seattle office. "I'm going to make them prove every claim."
Military law experts acknowledge that proving the case may be difficult, in part because the victims were buried quickly according to Muslim practice, which made autopsies impossible. It also will be difficult to bring Afghan witnesses to the United States and get them to testify.
U.S. military investigators have not been given access to the crime scenes, preventing them from collecting DNA and other evidence. However, Afghan investigators may have passed along DNA evidence they collected, an official said. Prosecutors presumably would want to tie victims' DNA to blood found on Bales' clothing.
U.S. policy and strategy remain unchanged - so far
Allen, the general in charge of the war, says the current plan to withdraw most foreign troops from Afghanistan by the end of 2014 has not changed.
"In the long run, our goals can only be achieved and then secured by Afghan forces," he told the House Armed Services Committee last week. "Transition, then, is the linchpin of our strategy, not merely the 'way out.'"
Defense Secretary Leon Panetta was not swayed by a New York Times/CBS News poll that concluded that 69% of Americans want U.S. troops to leave Afghanistan now.
"We cannot fight wars by polls," Panetta said Tuesday. "There's no question that the American people have tired of war just like the Afghan people have tired of war," but the U.S. government would continue with its strategy in Afghanistan, he said.
"We have to operate based on what we believe is the best strategy to achieve the mission that we are embarked on," he said. "And the mission ... is to safeguard our country by ensuring that the Taliban and al Qaeda never again find a safe haven in Afghanistan."
CNN national security analyst Peter Bergen notes with alarm the rising number of attacks on NATO troops, particularly Americans, by Afghan police officers and soldiers who are supposed to be allies.
"This pattern of attacks raises a fundamental problem for the plans of the United States and other NATO countries to draw down their forces over the next two years," Bergen wrote in an analysis for CNN. "That plan is, in part, predicated on the idea that as Afghan forces take the lead in security operations, they will be supported by small numbers of U.S./NATO advisers embedded in Afghan army and police units. Those advisers will be quite vulnerable to attack."
Dr. James M. Lindsay, a senior vice president at the Council on Foreign Relations, wrote in an essay for CNN that the war has outlived its purpose and has become too costly.
"Even if the objectives of the stay-the-course camp could be achieved, they arenâ€™t worth it in terms of blood and treasure," he wrote.