The FBI is searching for 240 victims of a man convicted of engaging in an extortion scheme to produce child pornography.
Officials say 31-year-old Lucas Michael Chansler persuaded 350 girls to expose themselves on video chats he secretly recorded, then threatened to put them online unless the girls provided more graphic images.
They say he targeted 350 minors across the US, Canada and the UK. Chansler has been sentenced to 105 years in federal prison.
Chansler used more than 135 known screen names including Captain Obvious, Victor Hugo and Cameroon.
If you have any information to help identify victims or were victimized by him please contact the FBI.
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