Police in the south western Nigerian state of Osun say they have embarked on a constant patrol after mobs lynched at least 12 people since last weekend. All the killings occurred after the victims were accused of making people's genital organs disappear. The Osun state police commissioner Ganiu Dawodu, who dismissed claims of organ disappearance, told the BBC that the mob killings started two weeks ago and has swept though six main towns in the state including the university town of Ife and the state capital of Osogbo. ''We are terribly worried about the mass hysteria leading to such mob...