It's a very worrying situation and more research is needed on the most effective punishment and treatment of offenders caught viewing child abuse pictures.
"Trying to stop the terrible trade in these images is obviously a huge task.
"But it mustn't be seen in isolation. It's part of a much bigger sexual abuse problem."
More top news
Police are not linking the explosion of the "incendiary device" to others which have caused panic in the city.
An estimated 70,000 claimants transferred to Employment and Support Allowance (ESA) from other benefits since 2011 were underpaid.
Plastics is one of a number of environmental issues facing the world's seas, along with rising sea levels and warming oceans.