NEW YORK -- Newsweek says a Canadian journalist working for the U.S. news magazine has been detained in Iran.

Newsweek identified the journalist as Canadian Maziar Bahari and said he was "detained without charge by Iranian authorities" Sunday morning in Tehran.

It said he has been living in Iran for the past decade and covering the country.

Online profiles of Bahari said he was born in Iran but studied in Montreal. He has a degree in communications from Concordia University.

Newsweek said Bahari's coverage of Iran has been fair. It called on the Iranian government to release him immediately.

Bahari is one of at least 24 journalists and bloggers known to have been arrested in Iran since protests began there a week ago over the recent presidential election.

In a statement, Newsweek said that "on Sunday morning in Tehran, Newsweek's Maziar Bahari was detained without charge by Iranian authorities and has not been heard from since."

"Mr. Bahari is a Canadian citizen and a renowned journalist and filmmaker, who has been living in and covering Iran for the past decade."

"Newsweek strongly condemns this unwarranted detention, and calls upon the Iranian government to release him immediately."

The magazine said Bahari's coverage of Iran "has always been fair and nuanced, and has given full weight to all sides of the issues."

"He has worked well with different administrations in Tehran, including the current one."

Newsweek said "the seizure of innocent journalists is a violation of the right to a free press in Iran."

It asked governments of the world to "use whatever influence they have with the government in Tehran to make clear that this detention is unwarranted and unacceptable, and to demand Mr. Bahari's release."