Robert Bales
Robert BalesAFP photo

Prosecutors will seek the death penalty for an American soldier accused of killing 16 Afghan villagers in one of the most appalling atrocities of the war, the U.S. military said Wednesday, according to a report in AFP.

Staff Sergeant Robert Bales faces 16 murder charges, six of attempted murder, seven of assault and two of using drugs. Seventeen of the 22 people killed or wounded were women or children and almost all were shot in the head.

If sentenced to death, Bales could be the first U.S. soldier executed for over half a century: the last was in 1961 when Private John Bennett was hanged for rape and attempted murder.

The 39-year-old is to face a full court martial authorized to sentence him to a maximum penalty of death for the alleged March massacre, the military announced.

"This decision was made after reviewing the Article 32 report of investigation," said a statement from Joint Base Lewis-McChord, referring to the report compiled from last month's so-called Article 32 hearings.

"The government will seek the death penalty," base spokesman Gary Dangerfield told AFP. The court martial will take place at the base, in the state of Washington, but no trial date has been set.

"If convicted of all charges (and specifications), the maximum punishment is death," said the base statement quoted by the news agency.

It stressed, however, that for capital punishment to be imposed, the court martial must unanimously agree certain conditions.

These are that Bales "is guilty of the eligible crime; at least one aggravating factor exists; and that the aggravating factor must substantially outweigh any extenuating or mitigating circumstances," it said.

Bales allegedly left his base in the Panjwayi district of southern Kandahar province on the night of March 11 to commit the killings, which included nine children. He allegedly set several of their bodies on fire.

Prosecutors at the Article 32 pre-trial hearing alleged that Bales left the base twice to carry out the killings, returning in between and even telling a colleague what he had done.

At the time of the incident, Bales was assigned to 2nd Battalion, 3rd Infantry Regiment, 3rd Stryker Brigade Combat Team. Pending his trial he will remain in custody at the base, south of Seattle.

At the end of the pre-trial hearings, Bales' family stressed that he was innocent until proven guilty, while his lawyer raised questions about the role of alcohol, drugs and stress in the tragedy.

"We are not convinced the government has shown us the truth, the whole truth and nothing but the truth about what happened that night," said a family statement, calling Bales "courageous and honorable."

Bales' lawyer Emma Scanlan questioned whether there was enough evidence for the case to go to full trial, citing possible post-traumatic stress disorder and other medical issues.

Prosecutors have lashed the "heinous and despicable" alleged massacre.

"Based on the sheer brutality and nature of the crimes, it is our recommendation to proceed to a general court martial," prosecutor Major Rob Stelle said last month.