The BBC is launching a new inquiry into the Panorama interview with Princess Diana 25 years ago.

Her brother Charles Spencer has accused the BBC of "sheer dishonesty" in the broadcast.

New evidence suggests Panorama host Martin Bashir used questionable tactics to secure the interview in 1995. Many observers believe the interview was the catalyst for the divorce of Diana and Prince Charles.

Earl Spencer said Bashir showed him allegedly fake bank statements to convince his family that members of the royal staff were being paid to reveal details about the princess and her marriage.

Bashir implied senior royals were in on the "web of deceit" against his sister, he says.

Spencer says Bashir misled and manipulated his sister so she would open up in the interview. In a strongly worded letter to the BBC the earl said he would never have introduced Bashir to Diana if he had known the documents were fake.

According to Daily Express, Spencer and new BBC director general Tim Davie are in talks as a result of Spencer's complaint. Spencer says he has "many questions" and has accused the corporation of yellow journalism.

Spencer wants the BBC to apologize "posthumously to Diana" and the public for whitewashing Bashir. He called on the corporation to make a donation to Diana's charities from the interview's profits.

Questions as to how Bashir secured the opportunity to talk with Diana were asked soon after it went to air.

Former BBC chief Tony Hall conducted an internal investigation in 1996. However, Bashir was cleared despite a statement by a BBC graphic designer saying he was approached to create a fake bank statement. The designer, however, didn't know why Bashir required the document.

Some 23 million viewers tuned in to Diana's Panorama interview - dubbed the "scoop of a generation." The interview took place three years after the Prince and then Princess of Wales were separated but not yet divorced.

Diana dropped a bombshell in the interview that her husband was not suited to become king. She also said that her marriage to Charles was "crowded" because of a third party - referring to Camilla Parker Bowles, now the Duchess of Cornwall and Charles' wife.

The comments stained her relationship with the royal family.

Diana confessed to her own affair with Capt. James Hewitt. She opened up about her depression, bulimia and self-harming.