Employees of the largest housing provider for unaccompanied migrant children in the U.S. repeatedly sexually abused and harassed children in their care for at least eight years, the Justice Department said Thursday, alleging a shocking litany of offenses that took place as the company amassed billions of dollars in government contracts.

Southwest Key Programs Inc. employees, including supervisors, raped, touched or solicited sex and nude images of children beginning in 2015 and possibly earlier, the Justice Department said in a lawsuit filed this week. At least two employees have been indicted on criminal charges related to the allegations since 2020.

It was not immediately clear how many children are currently in Southwest Key’s vast network of shelters across three states, which have room for more than 6,300 children. A Justice Department spokesperson declined to comment beyond the lawsuit announcement when asked whether the department recommended that children be removed from the shelters or that the the nonprofit’s contracts be terminated.

“In some cases, Southwest Key employees threatened children to maintain their silence,” the lawsuit states. “In harassing these children, these Southwest Key employees exploited the children’s vulnerabilities, language barriers, and distance from family and loved ones.”