Investigators seized more than 120 terabytes of child sex abuse material from a residence in Northern California on Thursday, according to the Solano County Sheriff’s Office.

Starting Monday, a French doctor will be tried on charges of raping and sexually assaulting 299 people over 25 years — almost all his patients, almost all children at the time of the suspected abuse.

A former surgeon accused of raping or sexually assaulting hundreds of young patients, some while they were under anaesthetic, went on trial on Monday in France's largest ever child sexual abuse case.

A former surgeon is set to stand trial in France on Monday for the alleged rape or sexual abuse of 299 victims, most of them children who were his patients, in what investigators and his own notebooks describe as a pattern of violence spanning over three decades.

A retired surgeon admitted in court that he committed “hideous” acts, as France’s largest ever child sexual abuse case got underway on Monday.

The white-haired 74-year-old, who wore glasses and a black zip-up sweater over a grey shirt, was addressing the court in Vannes, north-west France, on the first day of the largest child abuse trial in French history.

The trial of Joël Le Scouarnec, who is charged with the rape and sexual assault of 299 people in France over decades, is set to begin. The alleged victims’ average age was 11.

The trial for former surgeon Joël Le Scouarnec, who is charged with raping or sexually assaulting 299 victims over three decades, is set to be the largest trial of its kind in French history. NBC News’ Molly Hunter reports on how the country and activists groups are reacting to the allegations against the 74-year-old.