Twitter announced last week that it will remove posts that deny the Holocaust.

Bloomberg first reported the move on Oct. 14.

“Our Hateful Conduct Policy prohibits a wide range of behavior, including making references to violent events or types of violence where protected categories were the primary victims, or attempts to deny or diminish such events,” a Twitter spokesperson told the outlet.

“Twitter’s mission is to serve the public conversation and ensure the service is a place where people can express themselves safely,” added the spokesperson. “We strongly condemn anti-Semitism, and hateful conduct has absolutely no place on our service. We also have a robust ‘glorification of violence’ policy in place and take action against content that glorifies or praises historical acts of violence and genocide, including the Holocaust.”

Despite the decision, along with Google, the social-media site has declined to participate in a virtual event this week hosted by the U.S. State Department on combating anti-Semitism online.