4chan hackers are threatening to allegedly post nude photos of Emma Watson on the site. According to Business Insider, an ominous countdown clock appeared on a thread titled "Emma You Are Next" featuring a photo of the "Harry Potter" actress wiping a tear from her eye. The thread also included a note that read, "Never Forget, the biggest to come thus far."

The clock hints that something will happen within four days. It's not clear if the countdown clock is a prank, but a hacker has released hundreds of naked and racy images of female celebrities on the site over the past month.

In August, nude photos of several celebrities were dumped online including pictures of Mary Elizabeth Winstead, Kate Upton and Jennifer Lawrence.

Over the weekend, the hacker released a second batch, including topless photos of Gabrielle Union, Rihanna, Amber Heard, Meagan Good, Kim Kardashian and Vanessa Hudgens. Good confirmed that the topless images of her were real but slammed fans for continuing to share the pictures on social media.

"I'm definitely in shock [and] saddened for everyone who is experiencing this," Good wrote. "But I 'choose' not to give the persons responsible my power... At the end of the day - we all know these pictures were for my husband... And at the end of the day evidently we all know how I feel about my t***s."

"That's all I've got folks," the "Think Like a Man Too" actress added. "Oh yeah and for everyone's who's reposting the leaked nudes? You should be ashamed of yourself... you have a blessed day now."

On Saturday, Union and her husband Dwyane Wade issued a statement and said they had contacted the FBI over the actress' photos being leaked.

"It has come to our attention that our private moments, that were shared and deleted solely between my husband and myself, have been leaked by some vultures," the statement said, according to TMZ. "I can't help but to be reminded that since the dawn of time women and children, specifically women of color, have been victimized, and the power over their own bodies taken from them. these atrocities against women and children continue worldwide."