Omar Khadr, seen in 2002, is being held at Guantanamo Bay military prison.

There's confusion surrounding the military trial of Omar Khadr after revisions to legal documents indicated the Pentagon is charging the Canadian man with the deaths of two more people.

Khadr, 21, was originally charged with hurling a grenade that killed American Sgt. Christopher Speer during a firefight in Afghanistan in 2002. He's been in custody at a U.S. military prison in Guantanamo Bay, Cuba, since then.

The Pentagon alleges Khadr ambushed American troops at a mud compound in Afghanistan.

The charge sheet originally listed conspiracy charges against Khadr and a number of other fighters believed to be hiding out in the compound. The Pentagon alleged gunfire coming from within the compound killed two Afghan military interpreters working with U.S.-led coalition troops.

However, the charge sheet was revised by someone in Washington and the names of everyone but Khadr were struck through, so it appears Khadr has been charged in the deaths of two additional people.

Senior U.S. military officials at Guanatanamo, including the chief defence and prosecution lawyers, said they had not heard of the revision, said CBC correspondent Bill Gillespie, who is in Cuba.

"In fact, it will probably all boil down to a technicality," said Gillespie.

It's not the only confusion surrounding the Khadr case.

Earlier this week, Khadr's lawyers called for the murder charge against Khadr in connection with Speer to be dropped after U.S. military documents were inadvertently released to reporters at the Guantanamo prison.

The document, a first-hand account of the gun battle from a U.S. soldier, says Khadr was not the only person left alive in the compound when Speer was killed, as the Pentagon alleges.