Human rights defender Sylvestre Bwira Kyahi abducted by armed men in Congolese army uniforms in Goma, North Kivu province, on 24 August; he was found 30 kilometres outside Goma 6 days later; he was severely beaten; Bwira received threats in months prior his abduction; he had openly denounced General Bosco Ntaganda, a wanted war criminal who is now acting officer in Congolese army