Federal prosecutors in Illinois say a Texas man has been sentenced to 35 years in prison on child pornography charges involving more than 40 girls in eight states including Mississippi.

Prosecutors said Tuesday 36-year-old Mark P. Barnwell of Whitehouse, Texas, was sentenced on Jan. 9.

Authorities say he used false Facebook profiles to contact girls and advertise modeling opportunities. Prosecutors say Barnwell directed the girls to send him sexually explicit photos and threatened to post the nude photos online if they failed to send more.

Officials say Barnwell obtained nude photos from 43 victims, including 28 in central Illinois.

Others were from California, Iowa, Mississippi, Nevada, Texas, Washington and West Virginia.

Barnwell was ordered to remain on supervised release for the rest of his life when he completes the prison term.