Story highlights Namazi is 80 years old, has heart condition and needs medication, his wife said

His son is Siamak Namazi, an American businessman arrested in October

Before his father's arrest, he was the last confirmed U.S. prisoner detained in Iran

Washington (CNN) Six weeks after freeing U.S. citizens in a prisoner swap with the United States, Iran appears to have arrested yet another man whom Washington may take an interest in seeing freed.

Baquer Namazi, 80, is the father of American businessman Siamak Namazi, who was detained in October and was not part of last month's exchange. Before his father's arrest, he was the last confirmed U.S. prisoner still being held in Iran.

"I must share the shocking and sad news that Baquer was arrested in Tehran late evening of 22 February 2016 and as far as I have been told by those who took him taken to Evin prison," she wrote. "Now both my innocent son Siamak and my Baquer are in prison for no reason. This is a nightmare I can't describe."

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