Three Journalists -- including the Washington Post's Tehran correspondent -- arrested in Iran were detained for security reasons, the country's prosecutor said in a statement published on Monday. It was the first time an Iranian official has given a reason for the July 22 arrest of the Post's Jason Rezaian and a photographer, both of whom are dual US-Iranian citizens. Rezaian's wife Yeganeh Salehi, also a journalist, was detained the same day. It is a security case," Gholamhossein Mohseni-Ejeie, who is also the chief spokesman for the Iranian judiciary, said in a statement published by ISNA news agency.