Canada's government on Monday confirmed the disappearance of a Canadian citizen in Afghanistan, saying he traveled there as a tourist.
The Canadian government is also aware that the Taliban on Sunday issued a news release and video purported to be of the Canadian, said spokeswoman Lisa Monette of Canada's Department of Foreign Affairs.
CNN has not independently confirmed the authenticity of the video.
Christine Theodorou contributed to this report.
Editor's note: David Frum writes a weekly column for CNN.com. A special assistant to President George W. Bush from 2001 to 2002, he is the author of six books, including "Comeback: Conservatism That Can Win Again," and is the editor of FrumForum.
The killing of Osama bin Laden raises many haunting questions. Here's the most important:
Has our mission in Afghanistan become obsolete?
To think through that question, start with a prior question: Why did we remain in Afghanistan after the overthrow of the Taliban?
The usual answer to that question is: To prevent Afghanistan from re-emerging as a terrorist safe haven.
There have always been a lot of problems with that answer. (For example: Does it really take 100,000 U.S. troops, plus allies, to prevent a country from becoming a terrorist safe haven? We're doing a pretty good job in Yemen with a radically smaller presence.)Read the full story
A filmmaker tells CNN's Nima Elbagir what he found out when he filmed Osama bin Laden's jihad in Afghanistan.
Does the Taliban or al Qaeda pose a greater threat in a post-bin Laden world? CNN's Mohammed Jamjoom reports.
The mood among the troops at Bagram Air Base, the nerve center of American operations in Afghanistan, is one of cautious optimism. US soldiers acknowledge that the killing of Osama Bin Laden was a big achievement for America, but that their mission here is far from over.