More than 30 students at the University of Southern California are under investigation for their ties to the mastermind behind the sweeping college admissions scandal, according to a new report.

The 33 students identified in USC’s own probe — all linked to college prep whiz William “Rick” Singer — were all hauled in for “tense and often emotional” interviews, sometimes lasting up to three hours, the Los Angeles Times reported.

Now, weeks later, their fates at the highly regarded LA school are in limbo.

Lawyers for the students said university investigators promised to deliver a verdict within weeks, but have instead kept the students in the dark with no timeline in place, the report said.

The students were first emailed by USC investigators in March, after criminal charges were lodged against Singer and others implicated in the scandal. The school wanted to know if they lied to get in.

A few of them have been cleared, although it is unclear how many. But for most, it’s been a waiting game in a case that has turned into a protracted black eye for one of the nation’s top schools.

“For an academic institution to discover you’ve effectively got academic fraud is sort of a stab in the heart,” Wanda Austin, the school’s interim president last year, told the paper. She described the college’s internal review as “a very slow process,” but “a fair process.”

Singer pleaded guilty to masterminding a scheme that had parents paying some $25 million to get their kids into the high-profile school as bogus athletic recruits.

Among the celebrity parents caught up in the scandal are actresses Felicity Huffman and Lori Loughlin, who are accused of paying bribes to inflate their children’s athletic prowess and achievements to get into the school.

USC administrators implicated in the scandal include Donna Heinel, a top athletic department administrator at the school identified as Singer’s chief co-conspirator.

Prosecutors in the case allege that Heinel – who pleaded not guilty to criminal charges – would include Singer’s phony recruits before allotting admissions slots for legitimate student athletes submitted by coaches from various sports teams.

Nina Marino, Heinel’s attorney, said her client “vehemently denies any wrongdoing.”

The college’s internal review was launched in the wake of the criminal charges against Singer and others, including more than 30 parents.

USC has since screened “tens of thousands of applicants” trying to get into the school. Two outside firms were also hired to figure out how Singer was allegedly able to use the school as a piggy bank for years.

Lawyers for the 30 or so students who are awaiting their fates in the internal probe said they’ve been caught in the middle.

The students initially asked that the interviews be postponed until after final exams, but were denied. Following the interviews with college investigators, they were also allowed to submit written defenses or evidence they felt could clear them of wrongdoing – but nothing has come of it for most, the LA Times said.

A spokeswoman for the school said the delay has been caused, at least in part, by the “thorough nature of the investigations and the many opportunities the students are given to view and respond to any new evidence as it comes in.”