University law lecturer, 42, 'posed as Justin Bieber to trick children into sending nude photos' - and is charged with more than 900 child sex offences

Gordon Douglas Chalmers (pictured) allegedly posed as Justin Bieber online 'in order to solicit explicit images from young children'

Chalmers pretended to be pop superstar Justin Bieber (pictured)

Chalmers was charged with 931 offences on Wednesday, including rape, indecent treatment of children and making child exploitation material,using a carriage service to procure person under 16 and using a carriage service for child pornography material.

His offending is said to have dated back to 2007.  

He had also earlier been charged with a number of child sex offences. 

'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.

'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.

'The breadths of offences committed in this instance are frankly horrendous and I want to recognise the efforts and commitment of the investigative team at Taskforce Argos to keeping children safe.'

Chalmers will appear before Brisbane Magistrates Court on April 6.