Kenyan police said Wednesday they have launched an investigation after badly decomposed bodies, some of which bore signs of torture, were found in a river.A Kenyan rights group said it counted 21 unidentified bodies – all men – in a hospital morgue that workers there said had been retrieved from the River Yala in a scenic area of western Kenya. The AFP news agency reports that cases of enforced disappearances, sometimes blamed on the police and security services, are not uncommon in Kenya, and incidents of extrajudicial killings are also rife.