A former schoolmate of Christine Blasey Ford, a California psychology professor who has accused Supreme Court nominee Brett Kavanaugh of sexually assaulting her when they were in high school, clarified Wednesday that she has no first-hand knowledge of the alleged attack.

“I do not have first hand knowledge of the incident that Dr. Christine Blasey Ford mentions, and I stand by my support for Christine. That’s it. I don’t have more to say on the subject,” Cristina King Miranda tweeted Wednesday.

The clarifying tweet came just hours after Miranda posted a letter on Facebook saying Kavanaugh’s alleged assault on Ford “did happen.”

“This incident did happen,” Miranda wrote. “Many of us heard about it in school and Christine’s recollection should be more than enough for us to truly, deeply know that the accusation is true.”

Miranda further walked back her claim from the original Facebook post in an interview with NPR on Thursday, suggesting that when she said the incident “did happen,” she meant that it was her belief that it happened.

“That it happened or not, I have no idea,” Miranda said. “I can’t say that it did or didn’t.”

She explained that in her Facebook post she wanted to tell what she knew of the incident and what it led her to believe.

“In my [Facebook] post, I was empowered and I was sure it probably did [happen],” Miranda told NPR. “I had no idea that I would now have to go to the specifics and defend it before 50 cable channels and have my face spread all over MSNBC news and Twitter.”

While she was not at the party where the alleged incident took place and did not hear anything first-hand from a witness, there was a “buzz” that went around her school about what allegedly happened at the party, she said.

Ford told the Washington Post she was afraid Kavanaugh might “inadvertently kill” her during a high school party in the early 1980s, alleging that the Supreme Court nominee pinned her to a bed and groped her over a one-piece bathing suit.

Democratic Rep. Ted Lieu of California retweeted an Atlanta Journal-Constitution reporter’s tweet containing a copy of Miranda’s Facebook post.

“The FBI needs to interview this witness,” Lieu wrote of Miranda, before asking, “Will more witnesses step forward?”

Additional evidence below that Dr. Christine Blasey Ford is telling the truth about having been sexually assaulted by Brett Kavanaugh. The @FBI needs to interview this witness.

Will more witnesses step forward? https://t.co/npM5ms8byg

— Ted Lieu (@tedlieu) September 19, 2018

Miranda said Senate Judiciary staff reached out to her after her Facebook post. She told NPR she would not submit to an interview if asked.

Lawyers for Ford want the FBI to investigate the allegation against Kavanaugh before she testifies at a Senate Judiciary Committee hearing, a request that appears increasingly unlikely to be granted.

Judiciary Chairman Charles E. Grassley of Iowa said Wednesday that if Ford does not agree to testify, he may not move forward with a Monday hearing on the matter.