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Former New York Times Executive Editor Jill Abramson said Wednesday night that she was reviewing passages in her new book after being accused of plagiarism.

“I take seriously the issues raised and will review the passages in question,” she said on Twitter.

Abramson, whose book “Merchants of Truth” was released Tuesday, had previously been defiant in the face of the plagiarism allegations, telling Fox News host Martha MacCallum just hours earlier, “I certainly didn’t plagiarize in my book.”

The allegations against Abramson were made Wednesday by Michael Moynihan, a “Vice News Tonight” correspondent, who accused her on Twitter of plagiarizing multiple passages in the book.

Moynihan offered several examples in which the language used by Abramson was similar to language that first appeared elsewhere.

Moynihan said he discovered the issues while attempting to fact check her book, which profiles four newsrooms — Vice, BuzzFeed, The Times, and The Washington Post — amid a time of upheaval in journalism.

“While trying to corroborate certain claims, I noticed that it also contained…plagiarized passages,” he tweeted.

Abramson appeared unprepared for MacCallum’s questions on the matter.

“Do you have any comment on this?” MacCallum asked.

“I really don’t,” Abramson replied.

MacCallum pressed on, telling Abramson she was “going to be asked to respond.”

Abramson replied by denying charges of plagiarism, and saying that her book includes “70 pages of footnotes” at the end “showing where I got the information.”

MacCallum questioned whether Abramson simply forgot to insert footnotes in the areas where she stands accused of plagiarism.

“No, I don’t think it’s an issue at all,” Abramson replied.

Abramson added, “Many people from Vice have been taking issue with the book it seems…I think they don’t like the portrayal of Vice.”

Abramson did not respond to a request for comment from CNN Business Wednesday night.

Cary Goldstein, executive director for publicity at Simon & Schuster, which published Abramson’s book, said “Merchants of Truth” was “published with an extraordinary degree of transparency toward its subjects; each of the four news organizations covered in the book was given ample time and opportunity to comment on the content, and where appropriate the author made changes and corrections.”

Goldstein said Simon & Schuster was ready to work with Abramson to revise the work if changes and attributions “are deemed necessary.” Goldstein did not address the plagiarism allegations directly.

Abramson’s book first drew scrutiny in January when an unfinished galley copy was provided to various journalists in advance for review purposes. Some of the journalists featured in “Merchants of Truth” accused her of factual errors.

At the time, she noted in a tweet that the copy which had been distributed was a draft and not the finished version.

Brian Stelter contributed to this report