'Deeply disturbing': Children being tricked into sharing explicit images as 'sextortion' cases soar

Internet Watch Foundation received 191 reports of "sextortion" in the first half of 2014 .

The number of reports that saw action taken rose by 257% in the same period.

At least 6% of that content involved the most serious Category A images, the IWF said.

Teenagers are most likely to be targeted on social media platforms, the charity said.