Domingo, considered one of the best opera singers of all time, allegedly put his hands up the skirts of one woman and kissed others on the mouth without their consent.
The AP cites allegations from nine women, with a half-dozen others saying that Domingo's suggestive overtures made them uncomfortable.
Domingo has denied the accusations, but noted: "Still, it is painful to hear that I may have upset anyone or made them feel uncomfortable". I believed that all of my interactions and relationships were always welcomed and consensual. "People who know me or who have worked with me know that I am not someone who would intentionally harm, offend, or embarrass anyone", his statement read. It was promoted as a "special one performance-only event" with "one of the most influential singing actors in the history of opera" and was one of several gala events this year to celebrate his legendary career.
Seven of the nine accusers told the AP they feel their careers were adversely impacted after rejecting Domingo's advances, with some saying that roles he promised never materialised.
Of the nine accusers, none have presented documentation, such as phone messages, supporting the claims and only one has agreed to be identified - mezzo-soprano Patricia Wulf, who sang with Domingo at Washington Opera. The others requested anonymity, saying they either still work in the business and fear reprisals or are anxious they might be publicly humiliated or even harassed.More news: Iran says Britain to release Iranian oil tanker "soon"
Many women said that colleagues warned them never to be alone with the tenor, not even in an elevator.
"I have known Placido Domingo for more than 25 years", Rabl-Stadler said in a statement. Two of the women say that they succumbed to his advances, "feeling that they couldn't risk jeopardizing their careers by saying no to the most powerful man in their profession".
Domingo, 78, was accused by eight singers and one dancer of misconduct that seemingly began as far back as the 1980s and has included unwanted kissing, touching and fondling, often with the promise of opera work or connections as a result.
She said she regularly would rebuff him, but his pursuit remained relentless.
And then she said that that sort of creates a culture where people feel like this behavior is acceptable or there will be no consequences, and then others, maybe people who aren't superstar status, then have the opportunity or take advantage of that to do bad things themselves. Wulf sang with Domingo at the Washington National Opera, where he was the artistic director until 2011.More news: Questions Mount Over Epstein's Death in Custody
"I'm stepping forward because I hope that it can help other women come forward, or be strong enough to say no", she said.
"When I clearly was not going to have sex with him, he just walked me to the elevator and went back to his room".
Nearly all of the women's accounts followed a similar pattern that saw the singer, married since 1962, begin their working relationship by telling them he wanted to help advance their careers thanks to his impressive network of connections.
A spokeswoman for the Washington opera declined to answer specific questions from the AP about whether management was aware of any inappropriate behavior by Domingo and if any complaints ever had been made.More news: Kartik Aaryan presents himself to Sara Ali Khan on her 24th birthday