The attempt by someone to foreclose on Graceland is about to become the subject of multiple criminal investigations … TMZ has learned.

Multiple sources with direct knowledge tell TMZ … Graceland officials, along with people from Riley Keough‘s camp, were in touch with the FBI Tuesday, and we’re told the agency is “interested” in conducting a criminal probe.

We’re also told the would-be victims are in the process of contacting the Tennessee Bureau of Investigation.

As we reported, a judge was supposed to rule as to whether the foreclosure auction could move forward, triggered by an alleged unpaid $3.8 million debt Lisa Marie Presley never paid, supposedly using Graceland as collateral. Well, everything we’ve seen connected to this foreclosure looks sketchy, and that’s a generous take on what really went down.

TMZ.com

We’re told Lisa Marie never took out a $3.8 million loan, and the notary who supposedly witnessed Lisa Marie signing the loan documents says that never happened … she never even encountered Lisa Marie, ever.

The entity behind the foreclosure backed off the auction Wednesday, after a judge temporarily halted it. That’s especially weird … walking away from a supposedly unpaid $3.8M loan.