OTTAWA — Convicted terrorist Omar Khadr owes his American victims more than $130 million after failing to respond to their demands, says the victims' lawyer.

However, collecting any money from Khadr could prove difficult because of the hurdles involved in enforcing a U.S. judgment in a Canadian court.

The family of U.S. army medic Sgt. Christopher Speer, killed by Khadr's grenade in an Afghanistan firefight, as well as another soldier injured — Layne Morris — sued Khadr for $134 million and served him court documents in prison in June. After asking for two extensions, Khadr failed to respond by the deadline, which was Sept. 11, lawyers said.

Laura Tanner, counsel for the complainants, told QMI Agency Friday that she is now waiting for a law clerk in Utah to officially register Khadr's default. She will then petition a Utah judge to make Khadr officially responsible for owing the $130 million.

Khadr is imprisoned in Alberta.

A Canadian citizen, Khadr was 15 years old when he fought in Afghanistan with al-Qaida against U.S. soldiers. The Americans imprisoned him in Guantanamo Bay for 10 years.

McGill University Law professor Sunny Handa said that in order for his complainants to collect, a Canadian judge would have to make the ruling enforceable in Canada — a process called "homologation."

Khadr would likely fight that process, Handa said.

Even then, victims won't be able to collect money from Khadr if he doesn't have any.

However, Khadr is suing the Canadian government for $60 million, claiming his charter rights were breached through a "conspiracy" to keep him in the U.S.

Tanner said that his victims would "absolutely" want to tap those funds should he win in court.

But even if Khadr's victims don't see a dime from him, Tanner said the point of the lawsuit was to "send a message to terrorists that we won't stand for (violence) and will do what we need to legally protect our citizens."

Khadr's lawyer, Dennis Edney, did not respond to QMI's interview request.