Prince Harry alleges in a much-anticipated new memoir that his brother Prince William lashed out and physically attacked him during a furious argument over the brothers’ deteriorating relationship, The Guardian reported Thursday.

The U.K. newspaper said it obtained an advance copy of the book, “Spare,” due to be published next week, reports The Associated Press.

It said Harry recounts a 2019 argument at his Kensington Palace home, in which he says William called Harry’s wife, the former actor Meghan Markle, “difficult,” “rude” and “abrasive.” Harry says William grabbed his brother by the collar and ripped his necklace before knocking him down, the newspaper said.

“I landed on the dog’s bowl, which cracked under my back, the pieces cutting into me,” the book is quoted as saying. “I lay there for a moment, dazed, then got to my feet and told him to get out.”

Harry says he had “scrapes and bruises” as a result of the tussle. William later apologized, the extract says.

Separately, celebrity website Page Six reported that the book alleges William and his now-wife Kate encouraged Harry to wear a Nazi uniform to a costume party in 2005. Harry has repeatedly apologized and called the decision one of the biggest mistakes of his life.

Neither Buckingham Palace, which represents King Charles III, nor William’s Kensington Palace office has commented on the claims.

The book, scheduled to be released Tuesday, is the latest in a string of public revelations and accusations by Harry and Meghan.

Harry, 38, and the American actor married at Windsor Castle in May 2018. Less than two years later, the couple quit royal duties and moved to California, citing what they saw as the media’s racist treatment of Meghan, who is biracial, and a lack of support from the palace.

They have presented their side of the story in an interview with Oprah Winfrey and a Netflix documentary released last month, which recounted the couple’s bruising relationship with the U.K. media and estrangement from the royal family.

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