The media regulator said the ban would be in place "until further notice".
Ciara and Samuel L Jackson are among the big names who have become citizens of African countries in recent years.
Plotters misjudged the national mood and Benin's neighbours learnt from past errors, says analyst Paul Melly.
The Gambian government says it is hosting Tchiroma Bakary on humanitarian grounds.
They were not in court and have described the charges against them as “a legal farce”.
The presidents of Gabon, Guinea-Bissau, Liberia, Mauritania and Senegal hope to be offered "incredible" deals.
Equatorial Guinea has been rowing with Gabon for decades over three islands in potentially oil-rich waters.
Sylvia Bongo and her son was freed from prison last week despite facing charges of embezzling public funds.
This was the first presidential vote since the near-six-decade-long Bongo dynasty was overthrown.
