lilongwe police malawi say arrest 140 suspect members vigilante mob target people accuse vampirism clamp wave attack least nine lynch mob attack begin mid-september four district southern malawi belief witchcraft widespread week spread blantyre country second-biggest city mob torch one person stone another death wednesday far arrest 140 people suspect behind mob kill blantyre district investigations still go lexon kachama inspector general malawi police tell reporters police everything possible contain situation ensure violence spread cities townships say information minister nicholaus dausi tell reuters government put soldier streets stem vampire rumour result nine deaths deploy army townships district affect help police calm situation save live dausi say president peter mutharika also visit part country affect violence unite nations u.s. embassy blacklist several district malawi dangerous zone staffers nationals early month un pull staff two areas southern malawi malawi arrest 140 clampdown 'vampirism kill