A former Cedar Rapids School District bus attendant admitted sending sexual images and engaging in intercourse with three underage girls he met on his bus route.

Tyler Konigsmark, 20, of Cedar Rapids pleaded guilty in federal court Thursday to one count of enticement of minors. As part of the plea agreement, Konigsmark faces a minimum of 10 years in prison and a $250,000 fine.

At the plea hearing, Konigsmark admitted using Snapchat and his phone to request girls aged 12, 13 and 14 send him sexually explicit images. He also admitted having intercourse with a 12-year-old girl on two occasions.