The National Socialist Underground or NSU was a far-right German terrorist group which was uncovered in November 2011. So far, the following crimes have been attributed to the NSU: the Bosphorus serial murders, a series of murders of nine immigrants (eight Turks and one Greek) between 9 September 2000 and 6 April 2006; the murder of a policewoman and attempted murder of her colleague; the 2001 and 2004 Cologne bombings; and a series of 14 bank robberies. The Attorney General of Germany called the NSU a "right-wing extremist group", who have the purpose to "kill out of xenophobic and anti-state sentiments all citizens of foreign origin".