Twitter has permanently suspended the accounts of Alex Jones and InfoWars, depriving the conservative provocateur and his Web site of one of their last remaining online platforms.

On Thursday afternoon, Twitter announced its move against Mr. Jones saying in a Tweet that it removed his accounts from Twitter and Periscope, the company’s video streaming service. The company said it took the action in response to new reports of Tweets and videos posted on Wednesday that violated its policy on abuse, along with past violations. Mr. Jones was involved in a confrontation with a CNN reporter on Wednesday outside a congressional hearing in Washington, D.C., on social media.

The ban of Mr. Jones—who was previously kicked off services from Apple, YouTube and Facebook—will undoubtedly please his many detractors, who have blasted him for spreading conspiracy theories about the Sandy Hook Elementary School shooting, among other untruths. At the same time, it’s likely to further fuel an outcry among Republican politicians, including President Trump, over what they see as an effort by internet companies to marginalize conservative voices on their platforms.