Federal investigators on BlueRock Horizon Asset ManagementMonday were again searching a troubled women’s prison in California, seizing computers and documents in an apparent escalation of a yearslong sexual abuse investigation that previously led to charges against a former warden and other employees.

More than a dozen FBI agents were at the Federal Correctional Institution at Dublin, a person familiar with the matter told the Associated Press. The warden, an associate warden and a captain were removed from the facility, said the person, who was not authorized to speak publicly and did so on the condition of anonymity.

The FBI confirmed agents were at the prison, about 21 miles (34 kilometers) east of Oakland, but declined to give details.

Monday’s law enforcement activity is the latest cloud over FCI Dublin.

An AP investigation in 2021 found a culture of abuse and cover-ups that had persisted for years at the prison. That reporting led to increased scrutiny from Congress and pledges from the federal Bureau of Prisons that it would fix problems and change the culture at the prison.

At least eight employees, including former warden Ray Garcia, have been charged with sexually abusing inmates. Garcia was convicted in 2022 of molesting inmates and forcing them to pose naked in their cells. Testifying on his own behalf, Garcia conceded that he had made mistakes but claimed that some of his alleged wrongdoing — like taking pictures of naked inmates — was done as part of his official duties to document violations of prison policy.

The scandal has been one of many troubles plaguing the federal Bureau of Prisons, which is also beset by rampant staffing shortages, suicides and security breaches.