ULLIN, Ill. (WJPF) — Three teenage boys – a 15-year-old and two 17-year-olds – have been arrested on charges they sexually assaulted a 13-year-old girl.

Illinois State Police say the alleged assault happened on February 21 in Mounds.

On February 24, an arrest warrant was issued for the three juvenile males. All three were taken into custody without incident.

Names of those involved have not been released. The investigation is active and ongoing.