Bangladesh, June 6 -- San Francisco, June 6 (AP/UNB) - YouTube updated its hate speech policies Wednesday to prohibit videos with white supremacy and neo-Nazi viewpoints.

The video streaming company says it has already made it more difficult to find and promote such videos, but it's now removing them outright. YouTube will also prohibit videos that deny certain proven events have taken place, such as the Holocaust.

The changes come as YouTube, Facebook, Twitter and other online services face mounting concern that the services allow, and in some cases foster , extremism.

YouTube's new policies will take effect immediately. Specifically, the service is banning videos "alleging that a group is superior in order to justify discrimination, ...