BBC Antonio Guterres UN says Syria refugee crisis worst since Rwanda (BBC News) worst for twenty years UN says Syria refugee crisis worst since Rwanda military involvement in Syria military involvement in Syria The United Nations has said UN: Syria Crisis 'Worst Since Rwanda' military involvement in Syria UN says Syria refugee crisis worst since Rwanda since the genocide in Rwanda in 1994 Over 100,000 people have lost their lives in Syria military involvement in Syria the worst refugee crisis since Rwanda