A 23-year-old Rock Island man has been arrested on charges he watched online videos of a 13-year-old girl having sex with a man.

Scott D. Sparkman, 1600 18th Ave., is charged with four felony counts of aggravated possession of child pornography.

“We got an Internet-based alert,” Rock Island Deputy Police Chief Jason Foy said Wednesday. “That’s how we discovered it.”

Sparkman looked at the videos on his home computer on four occasions in 2012, court records state. The videos were described in records as “lewd” and showing the girl and the man engaging in various sex acts.

Police arrested Sparkman on a warrant Monday.