The hacking group Anonymous took out GOP frontrunner Donald Trump’s Trump Towers website for roughly an hour on Friday as a statement denouncing his proposal to ban Muslims from entering the United States.

Reuters reports:

The website for 68-story Trump Towers (http://trumptowerny.com), which Trump often uses for his presidential campaign, was down after Anonymous (@YourAnonNews) announced on Twitter: “Trump Towers NY site taken down as statement against racism and hatred. http://www.trumptowerny.com/(what you see is cloudflare offline backup)”

Anonymous also posted a YouTube video earlier this week with the message: “Donald Trump think twice before you speak anything. You have been warned Mr. Donald Trump.”