Of the many outrageous allegations revealed by federal prosecutors in the college cheating scandal, one stands out.

Someone paid $6.5 million to get his or her children into elite schools. But the identity of that parent — and details about which schools were involved — remains a mystery nearly two weeks after authorities in Boston filed the charges against dozens of wealthy individuals.

The lack of information about the money is more notable given that the charges go into intense detail about the alleged actions of other parents, who are accused of bribing and cheating to get their kids into schools such as Yale, USC and UCLA.

Prosecutors have mentioned the $6.5 million in payments at a news conference and in court. But they are not included in the hundreds of pages detailing the charges.

“The name was not divulged,” Christina Sterling, a spokeswoman for the U.S. attorney’s office in Boston, told The Times in an email. “We did not tie the amount to anyone by name. That is not public.”

She declined to say whether the person who paid the massive sum is among those already charged. But that is unlikely because the court records show none of the other parents allegedly paid anywhere close to that amount of money.

The payment is more sign that there is still much more to come in the case that has rocked American universities and placed a harsh spotlight on the college admissions process.

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Andrew Lelling, the U.S. attorney for Massachusetts, said the case is ongoing. Several elite Southern California prep schools have received subpoenas from prosecutors seeking information about some of the students involved in the fraud case. Although the prep schools are not targets of the investigation, prosecutors want to know whether the parents and others accused in the case sought or received help from the schools, sources told The Times.

One source with knowledge of the situation said some of the records federal authorities are demanding are for names not included in the charges filed last week in Boston federal court.

Many parents already facing charges also are under increasing pressure to cooperate and assist prosecutors with bringing charges against others.

It remains unclear how many parents took part in the college admissions scam. Court documents said college fixer William “Rick” Singer had more than 700 clients.

The case accuses Singer, a slew of university coaches and more than 30 parents, including actresses Lori Loughlin and Felicity Huffman.

It centers on a Newport Beach college placement firm run by Singer. Wealthy parents are accused of paying Singer to help their children cheat on college entrance exams and to falsify athletic records of students to enable them to secure admission to elite schools, including UCLA, USC, Stanford, Yale and Georgetown, court records show.

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More than 750 parents used Singer’s services, according to prosecutors. While 33 have been charged, prosecutors have sent subpoenas to high schools in Southern California with names of students whose parents have not been charged, suggesting that authorities are preparing to expand the number of prosecutions, according to sources who have seen the documents.

Sources familiar with the investigation but not authorized to discuss it say several parents and their attorneys have been informed they are the subject of the federal inquiry.

Within the massive charging documents, there also are unidentified people who made payments to Singer and various coaches but have not been charged.

The family of a person identified as only “Yale Applicant One” paid Singer $1.2 million, including $900,000 into his charitable organization. Singer, according to the documents, was introduced to the applicant’s family in November 2017 by a financial advisor. The girl’s father told Singer he wanted to make a “donation” for his daughter’s application.

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Singer sent the girl’s admissions application to Yale women’s soccer coach Rudy Meredith, along with her art portfolio, and told Meredith he would change the materials from art to soccer.

On Nov. 17, Singer sent the coach a fabricated athletic profile for the student, making her the co-captain of an elite Southern California soccer club. Singer then got Laura Janke, a former assistant coach at USC, to create the phony credentials, according to documents.

“Need a soccer pic probably Asian girl,” prosecutors say Singer wrote in the email. “Jr National Development team in China … we saying she got hurt this spring so was not recruited til now.”

At the start of the new year, Singer sent Meredith, who had coached the Yale soccer team for more than two decades, a check for $400,000, drawn on the Key Worldwide Foundation charity account.

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It was Meredith’s actions that led to the scam’s unraveling. Prosecutors say he solicited $450,000 from another parent, who had previously been charged with securities fraud and promptly gave up the coach’s offer, eventually wearing a concealed microphone during a payoff meeting with Meredith in April 2018. The coach ultimately told federal prosecutors of his deal with Singer.

Yale said in a statement that one of two students linked in court records to the scam was admitted and currently attends the university, while the other was denied entry.

Meredith and Singer have been cooperating with investigators since last year, officials said. Meredith, who resigned from Yale in November, has agreed to plead guilty to wire fraud, honest services fraud and conspiracy. Singer has pleaded guilty to a series of related fraud charges.

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Because authorities got the cooperation of the kingpin, court records show that prosecutors have some of the defendants on wiretaps talking about cheating and bribes aimed at getting their kids into elite colleges. Legal experts say that makes for a strong case and increases the likelihood of early pleas.

Usually, fraud refers to a scheme to obtain money from someone through a false promise. But in 1988, Congress expanded the anti-fraud law. A one-line amendment made it a crime to deprive someone of the “intangible right of honest services.”