The Boone County Sheriff's Department arrested a Columbia man Thursday on suspicion of uploading pornographic images of boys to photo sharing service Tumblr.

The department's Cyber Crimes Task Force received a tip on July 24 from the National Center for Missing and Exploited Children that someone in Boone County had uploaded the images showing boys' genitals, the task force said in a news release. An investigator tried to locate the suspect, Dakota Smith, on Tuesday but Smith was not home, the release said. Smith went to the sheriff's department the next day and investigators seized his cellphone, finding evidence that he had possessed child pornography, the release said.

Smith was arrested on suspicion of one count of possession of child pornography and posted a $4,500 bond Thursday. It was not clear if he had a lawyer, and information about the case was not available online Thursday afternoon.