Tips on how to deal with webcam blackmail, or sextortion, if you're a victim
"Sextortion" is a form of blackmail where victims are persuaded to take part in sexual acts in front of a webcam.
The criminals then threaten to share video with the victims' friends and family, unless a sum of money is paid.
New figures show that at least four suicides in the UK have been linked to this type of bribery in 2016.
Cases are being investigated by the National Crime Agency (NCA) and some of the victims so far have been just 14.
Video captionThe man, from north Wales, thought he was talking to a local woman
Most vulnerable are men aged 21 to 30, but there is a substantial proportion in the 11-20 age group.
The NCA has joined forces with the National Police Chiefs Council to give advice to people who may have been targeted.