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The Manhattan district attorney is seeking a new grand jury indictment against Harvey Weinstein that would allow the actress Annabella Sciorra, who has accused him of rape, to testify at his criminal trial next month.

Ms. Sciorra, who is known for her work in “The Sopranos,” has said that Mr. Weinstein attacked her in her Gramercy Park apartment in 1993, but that the incident was too old to be prosecuted under state law.

Mr. Weinstein, once one of Hollywood’s most powerful producers, has been indicted in Manhattan on rape and other sex crime charges stemming from the accusations of two other women. His trial starts on Sept. 9.

But now the district attorney, Cyrus R. Vance Jr., is maneuvering to use Ms. Sciorra’s account at trial to bolster counts in the indictment that charge Mr. Weinstein with predatory sexual assault. The charge carries a life sentence.