WASHINGTON — Twitter on Tuesday suspended the account of the far-right conspiracy theorist Alex Jones for a week after he tweeted a link to a video calling for supporters to get their “battle rifles” ready against media and others, in a violation of the company’s rules against inciting violence.

The social media company followed up on Wednesday by also suspending the account for Infowars, the media website founded by Mr. Jones, for posting the same video.

The twin actions effectively prevent Mr. Jones and Infowars from tweeting or retweeting from their Twitter accounts for seven days, though they will be able to browse the service.

The moves were Twitter’s harshest against Mr. Jones and Infowars after other tech companies took steps last week to ban them from their platforms. The removals began when Apple announced it would purge videos and other content by Mr. Jones and Infowars because of hate speech, followed by Facebook, YouTube and then Spotify. Twitter was the sole holdout among the major tech companies in not taking down content from Infowars and Mr. Jones, who has called the Sandy Hook shooting a hoax conducted by crisis actors.