Between August 31 and November 9, 1888, a slew of murders occurred in the Whitechapel district of London. Each of the five female victims were found mutilated with a knife, several were missing internal organs. Authorities interviewed more than 2,000 individuals but the investigation was notoriously disorganized. During the course of the murders, news agencies in the area received body parts and letters attributed to the killer. The letters featured the ominous signature Jack the Ripper. In addition to the five murders attributed to Jack the Ripper, there were six other similar murders in Whitechapel between 1888 and 1891 that might have been perpetrated by the Ripper or a copycat killer. No one was convicted and the case remains unsolved.