ASTANA - Salafists, the followers of an ultra-conservative school of Islam, were behind a planned attack foiled by Kazakh security services, the head of national security committee KNB said on Thursday. KNB said on Wednesday it had detained several members of a group which planned 'terrorist acts using improvised explosive devices.' One of the suspects had killed himself by detonating such a device. Speaking to reporters on Thursday, KNB head Vladimir Zhumakanov said the six detainees were Salafists, but added they had no links to those behind a deadly attack in the city of Aktobe earlier this month.