Detectives in San Bernardino County are investigating a man who may have sexually assaulted children over several years at a Yucca Valley home. Julio Cesar Vega Medina was named a suspect in three sexual assault cases with victims’ ages ranging from 5 to 14. WATCH HERE WATCH HERESome of the alleged sexual assaults occurred at a private residence where Medina played a role in religious gatherings, the San Bernardino County Sheriff's Department said. The sheriff’s department did not say what the “religious gatherings” entailed. Medina used several alias, including Julio Calzada-Vega, Julio Calzada, Julio Vega Calzada, Julio Medina, Julio Cesar Vega and Julio Cesar Vega Medina.