Answer
In 1960, Rwagasore was placed under house arrest by the Belgian colonial authorities, after he formed the Rassemblement Démocratique du Rwanda (RDR). The RDR was a political party that called for the independence of Rwanda and the end of Belgian colonial rule. The Belgian authorities feared that the RDR would become a threat to their power, and so they arrested Rwagasore and placed him under house arrest.