Cameroonian Lapiro de Mbanga in exile to the United State of America ?

The Cameroonian singer and activist for Democratic change in Cameroon  Lapiro de Mbanga is been reported by many to be on exile to the United State of America early this September 2012.
  

The artist "in controversy" left Cameroon, September 2, 2012, along with much of his family. No information yet no formal filter on the reasons for his departure. But the information that is making waves in his native rural-urban the mid Department of Mungo is that he is  paying the price for his audacity to face and challenge the political and administrative authorities of the country and their clerks in the region with his song (which by many is considered to be a cry for change in the Cameroon political system).

Where is Human Right? Where is Freedom of speech for the Cameroonian citizens?