for the abductions was distributed in 1991 to all Victorian homes, and in certain areas in South Australia and New South Wales. Huge posters were placed in public places. The task force was disbanded in January 1994. The task force investigated earlier sexual crimes from 1985 to 1987 with similar modus operandi, but could not locate some witness statements and crime scene exhibits, including a tape used to tie up a victim and also a rope used to tie a victim. The head of the Spectrum Task Force, David Sprague, said that some exhibits hadn't ever been examined by forensics, and had either been lost or thrown out. The police established a Rape Squad in April 1989, with nine detectives dedicated to investigating serial rapists throughout Victoria, particularly in Melbourne. The police established the unit after a review into the effectiveness of their rape investigations, by the Rape Investigation and Evaluation Group, found they needed a more coordinated and professional approach to investigations. On 14 December 2010, police announced that the Apollo Task Force had been established about eight months earlier, following substantial new intelligence. The new task force had been reviewing both the Spectrum Task Force investigation and some new leads that had surfaced in the last year or so. The Apollo Task Force closed in June 2013 after finding the intelligence was not credible, ruling out the suspect. On 9 April 2016, the Herald Sun newspaper published details of the Spectrum Task Force's dossiers on seven suspects, known as the Sierra Files, that were produced with the assistance of the US FBI. The newspaper also published details of police witness statements from the victims and their families. On 13 April 2016, on the twenty-fifth anniversary of Chan's murder, the police increased the reward for information on her death to A$1 million. Earlier crimes There had been varying reports by the media of suspected attacks prior to 1987. The police have never released specific details of suspected attacks. Detective Stephen Fontana answered a journalist's question in 2001 on earlier attacks, saying "that there just wasn't enough known about him and he didn't want to speculate". In a 2019 television documentary, retired Detective Chris O'Connor said that there was "broadly speaking perhaps up to a dozen" victims for the investigation. The first victim was a 14-year-old girl who was abducted from her home in Hampton in February 1985. During her