U.S. worried about American scholar detained in Iran: Via Reuters on Yahoo! News.

WASHINGTON (Reuters) – The United States called on Iran on Monday to release U.S. citizen Kian Tajbakhsh and said it was "deeply concerned" about the scholar, who was detained in Tehran last week and has previously been accused of spying.

Tajbakhsh, an Iranian American who holds a doctorate in urban planning from Columbia University, was arrested by Iranian authorities in May 2007, charged with spying and then released after more than four months in Tehran's Evin prison.

It was not clear why Tajbakhsh was detained last week.
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