Queensland police have a arrested a 42-year-old man who allegedly posed as Canadian pop singer Justin Bieber to solicit pictures from children. Picture: AFP/ Christophe Archambault

Gordon Douglas Chalmers allegedly used Facebook and Skype to impersonate the pop star and persuade fans to send him explicit images, police say.

The 42-year-old was arrested in November last year on a string of child sex offences after a tip-off from German and US authorities led Queensland police to raid his home.

At the time, police opposed bail on the grounds that Chalmers was likely interfere with evidence and witnesses. They also cited fears his “rapacious appetite” for contacting children would lead him to commit further offences.

Police allege Chalmers “refused” to provide police with access to his social media and messaging accounts and cloud servers.

As a result, he was charged with an additional 931 child sex offences, including, rape, indecent treatment of children, making child exploitation material, using a carriage service to procure person under 16, and using a carriage service for child pornography material.

Queensland law lecturer Gordon Douglas Chalmers has been charged with more than 900 child sex offences after allegedly posing as Justin Bieber to solicit images from young fans.Source:Supplied

It will be alleged that Chalmers used multiple online platforms including Facebook and Skype to communicate with his victims.

“This investigation demonstrates both the vulnerability of children that are utilising social media and communication applications and the global reach and skill that child sex offenders have to groom and seduce victims,” Detective Inspector Jon Rouse said in a statement released this morning.

“The fact that so many children could believe that they were communicating with this particular celebrity highlights the need for a serious rethink about the way that we as a society educate our children about online safety.

Detective Inspector Rouse said the breadth of allegations “are frankly horrendous and I want to recognise the efforts and commitment of the investigative team at Taskforce Argos to keeping children safe.”

It is alleged Chalmers’ offences date back to at least 2007.

Do you know more? Email marnie.oneill@news.com.au

A Queensland man posing as Justin Bieber has been charged with more than 900 child sex offences. Picture: Kevin Winter/Getty ImagesSource:Getty Images