GUANTANAMO, Cuba–A U.S. military commander altered a report on a firefight in Afghanistan to cast blame for the death of a Delta Force commando on a Canadian youth who was captured after the shooting stopped, a defence lawyer said today.

The attorney, Navy Lt. Cmdr. William Kuebler, made the allegation at a pretrial hearing as he argued for access to the officer, identified only as Col. W., as well as details about interrogations that he said might help clear his client of war-crimes charges.

The U.S. military has charged Omar Khadr of Toronto with murder for allegedly throwing a grenade that killed Sgt. Christopher Speer during a U.S. military raid on July 27, 2002, on an Al Qaeda compound in eastern Afghanistan.

Khadr’s case is on track to be the first to go to trial under a military tribunal system at this U.S. Navy base in southeast Cuba.

The military commander’s official report the day after the raid originally said the assailant who threw the grenade was killed, which would rule out Khadr as the suspect.

The report was revised months later, under the same date, to say a U.S. fighter had only “engaged” the assailant, according to Kuebler, who said the later version was presented to him by prosecutors as an “updated” document.

Kuebler told reporters after the hearing that it appears “the government manufactured evidence to make it look like Omar was guilty.”

Army Col. Bruce Pagel, the deputy chief prosecutor for the Guantanamo tribunals, said the government didn’t fabricate evidence.

He said he couldn’t discuss the commander’s report further because it will be used as trial evidence.

Khadr, who was captured when he was 15, is among roughly 80 detainees the Pentagon plans to prosecute at Guantanamo. So far, roughly a dozen of the 275 men held at Guantanamo have been charged with war crimes.

Kuebler said the trial will likely hinge on statements that Khadr made to interrogators when he was held at a military prison at Bagram air base in Afghanistan.

The attorney asked to be provided with the names of the interrogators as well as what techniques they used.

His interrogators included members of a unit implicated in the December 2002 beating deaths of two Afghan detainees, named Dilawar and Habibullah, Kuebler said.

Kuebler showed the judge a photograph of Khadr after his capture, with two gaping exit wounds in his chest from gunshots to his back, and said he would have been particularly vulnerable to coercion when he arrived at Bagram.

“We’re not talking about an adult of able physical and mental condition,” he said.

The lead prosecutor, Marine Corps Maj. Jeffrey Groharing, said defence lawyers have not demonstrated that speaking with individual interrogators would benefit their case.

He said the government already has provided typewritten summaries of the Bagram interrogations.

Kuebler bristled at the prosecutor’s decision to withhold information it does not consider relevant to the case.

“What does he know about our case, and what might help us prepare for trial?” he asked.

The judge, Army Col. Peter Brownback, scolded both sides for not co-operating more closely on evidence-related issues that could delay the trial, currently scheduled for May.

He said he would rule on most of the defence motions by late Friday.

Brownback also ordered prosecutors to provide the defence with official correspondence regarding the case between the U.S. and Canadian governments.