“Iran has arrested another American holding dual citizenship, bringing to four the number of Iranian Americans imprisoned in Tehran after they came under suspicion by hard-line security forces.
Siamak Namazi, a businessman based in Dubai who is in his early 40s, was arrested earlier this month when he was visiting a friend in Tehran, according to a family friend who did not want to be identified. It was not clear whether any charges have been brought against him or what authorities might allege he did.”
Source: Another Iranian American arrested and imprisoned in Tehran – The Washington Post