Australian police have revealed a man who allegedly posed as popstar Justin Bieber in order to obtain and solitict explicit images of children faces more than 900 sex offences.
Gordon Douglas Chalmers has been charged with a total of 931 child sex offences dating back to 2007.
The charges include allegations of rape and making material of child exploitation.
The 42-year-old is alleged to have used online communication tools like Facebook and Skype to pretend to be the Canadian singer.
Chalmers, who works as a law lecturer at Queensland University of Technology in Brisbane, was arrested after officers in Queensland were tipped off by German and American authorities.
Police said a "thorough examination" of his personal computer revealed a large amount of explicit material of children, dating back a decade.
Across the range of offences faced by Chalmers, there are a total of 151 alleged victims - including 50 in the United States and 20 in the United Kingdom.
Detective inspector Jon Rouse said: "This investigation demonstrates both the vulnerability of children utilising social media and communication applications as well as the global reach and skill child sex offenders have to groom and seduce victims.
"The fact so many children could believe they were communicating with this particular celebrity shows the need for a serious rethink about the way we educate our children about online safety.
"The breadth of offences committed in this instance is horrendous. I want to recognise the efforts and commitment of the investigative team to keeping children safe."
Chalmers is due to appear at Brisbane Magistrates Court on April 6.