"Hundreds of vagrants, thieves and street kids, some as young as 14, have been sent, without a trial, to the remote island of Iwawa - an extreme example of the levels of repression in Rwanda.", described the New York Times his video that you can find here. The link behind is: http://video.nytimes.com/video/2010/04/30/world/1247467728715/rwandas-island-prison.html.
There is also an article "'Island of No Return' mars Rwandan utopia" about the same island. You can read it by clicking on corresponding link from the list of recommended documents.