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The Los Angeles Police Department revealed Tuesday afternoon that 52 patients of former USC gynecologist George Tyndall have come forward accusing him of sexual misconduct.

The doctor is thought to have seen more than 10,000 patients, according to police. The 52 women will participate in the department’s ongoing investigation into whether multiple allegations of sexual harassment and other misconduct against the doctor constitute actual criminal conduct.

Thirty-nine of those 52 patients initially contacted USC’s hotline, which was created through the university’s Title IX program. Those women, according to the LAPD, were willing to release their information to the department. The other 13 women contacted LAPD directly through phone and email to express concerns about their previous contact with Tyndall, authorities said.

And authorities believe there could be more possible victims.

“We wanted to personally outreach to those who may have been impacted and believe they have been the victim of criminal conduct,” LAPD Assistant Chief Beatrice Girmala said.

Deputy Chief Justin Eisenberg said that the 52 alleged victims have reported incidents from 1990 to 2016, which corresponds to Tyndall’s tenure at the university.

Tyndall, 71, is accused of dozens of instances of inappropriate sexual misconduct over the course of his nearly 30-year career at USC. A 2016 internal investigation conducted by the university determined Tyndall’s behavior was consistent with sexual harassment, according to the Los Angeles Times. The newspaper published an investigation that revealed Tyndall was suspended with pay before signing separation papers in June 2017.

Tyndall has repeatedly denied any wrongdoing in interviews with the Times.

On May 25, the Times reported that more than a dozen women have come forward in separate civil lawsuits against Tyndall and the university, all of whom allege that he inappropriately touched them during exams. In total, about 300 people have contacted the university with concerns about Tyndall’s  behavior, the Times reported.

Billy Hayes, commanding officer for the Robbery and Homicide Division, said during Tuesday’s news conference that the LAPD has not had any contact with Tyndall because the first part of the investigation is to find out if the alleged victims are victims of a crime. Through interviews with the women and witnesses, Hayes said investigators can determine if the accounts rise to a criminal standard.

The scope of charges that could possibly be brought against Tyndall span a “wide range,” Hayes said. “Right now, we are seeing a lot of inappropriate comments, which obviously do not constitute a crime, but we could also look at digital penetration as a more significant crime.”

Hayes referenced recent cases within the Hollywood entertainment industry before adding that the investigation could go on for months.

In the wake of the allegations against Tyndall, USC President C.L. Max Nikias stepped down from his position.