Tissue samples from a suicide bomber that killed a Canadian soldier in Afghanistan are being sent to Canada, in an attempt to figure out who the attacker was.

CTV's Matt McClure, reporting from Afghanistan, said the big question is whether the bomber was Abdullah Khadr. Khadr, 22, was born in Toronto and is the son of Ahmed Said Khadr, who was alleged to have al Qaeda links.

The Taliban identified Khadr as the bomber strapped with explosives who killed himself, along with Canadian Cpl. Jamie Murphy and a bystander, on Jan. 27 on a Kabul street.

Khadr has been accused of running an extremist training camp in Afghanistan.

Khadr's brother in Toronto, Abdurahman, denied claims Abdullah was the suicide bomber. In early February, he told CTV's Canada AM the Taliban was wrong.

"This Taliban person has no idea what he's talking about. He makes some references to our family in the report, but there's names there that are so messed up, I don't know where he got them from. I don't know why he would put it on our family."

It could be at least a few weeks before they get any answers, according to McClure. It will take that long for the RCMP crime lab in Ottawa to run DNA analysis on the samples.

"They are hoping that these tests will at least help them determine the ethnicity or nationality perhaps of the suicide bomber, if not his actual identity."

It took about three weeks to collect and send the samples from the bombing, according to Capt. Lucie Tremblay, head of the Canadian Forces National Investigation Service in Kabul.

She would not say what type of evidence is being used to compare the tissue samples from the bomber.

Kabul city police have also taken samples.

Meanwhile, a Canadian soldier shot in the face by his own C-7 rifle on Sunday is on his way to Canada. The 43-year-old sergeant from Quebec is still in serious condition but it expected to recover.

Investigators are unsure whether the rifle discharged in error, or whether this was a suicide attempt.

The sergeant, who was shot in the chin, has not been identified by military officials.