A former Smith County firefighter will serve 18 years in prison for uploading pornographic images of minors 278 times on the messaging app Snapchat while on duty.

Silas Franks, 25, of Terrell entered a guilty plea Thursday on seven counts of possession of child pornography with the intent to promote.

Franks is a former employee with Smith County Emergency Services District No. 2 as a Red Springs Volunteer Fire Department firefighter.

Franks was sentenced to 18 years for each charge, but he will serve the sentences at the same time. Franks has been in the Smith County Jail since Dec. 6 on the child pornography charges, according to jail records. He will receive credit for time served.

According to the arrest affidavit, Franks used his Snapchat account to upload 11 files of child pornography. Franks was using the wifi of the Red Springs Fire Department to upload files, according to the Smith County Sheriff’s Office.

Based on Snapchat records, the affidavit states that his account used the department’s wifi for Snapchat 278 times to upload pornographic files of children on July 15.

The visual material included sexually explicit images of young children and bestiality, according to the arrest affidavit.