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.