BUFFALO, N.Y. (AP) — A suburban Buffalo man faces at least five years in prison after pleading guilty to child pornography charges.

Federal prosecutors say 25-year-old Joseph Lombardo of Lancaster used pseudonyms while contacting adolescent girls via social media and convincing them to send him dozens of naked pictures.

Lombardo also is accused of having sexual contact with two of the girls.

Authorities say they found evidence on Lombardo's computer of at least three victims.

Lombardo is scheduled to be sentenced in March.