The Department of Justice has launched a probe into Harvard University’s use of race in admission practices to determine whether the Ivy League school is discriminating against Asian-American students, according to a report on Tuesday.

The department is investigating claims made in a 2014 lawsuit brought by the nonprofit group Students for Fair Admissions that alleges Harvard is limiting the number of Asian students for admission, the Wall Street Journal reported.

The suit, filed in Boston, claims the practices violate federal civil rights law and asks a federal judge to ban the school from using race to determine who is admitted, the report said.

The suit is pending.

The Civil Rights Division of the DOJ sent a letter dated Nov. 17 to Harvard’s lawyers that it was investigating whether the school violated Title VI of the Civil Rights Act of 1964 that prohibits discrimination based on race, color and national origin for organizations that get federal funding.

The letter also claimed Harvard missed a Nov. 2 deadline to release documents on its admissions policies and practices.

The agency said it “may file a lawsuit” to force Harvard to comply with the request for documents by Dec. 1. Those documents have already been released to the plaintiffs in the federal lawsuit, the newspaper reported.

“The Department of Justice takes seriously any potential violation of an individual’s civil and constitutional rights,” said DOJ spokesman Devin O’Malley.

Seth Waxman, a partner at WilmerHale, the law firm representing Harvard, had no comment.

Despite Harvard’s offer to work “collaboratively” with the DOJ, the school has balked at providing information.

“Harvard has pursued a strategy of delay and has not yet produced even a single document,” said a letter sent from the DOJ to Waxman, the report said.