Based on the images, the feature would append a bright orange label including the words \"Harmfully Misleading\" if the tweet is flagged as containing mis- or disinformation.

\"PHOTO:
NurPhoto via Getty Images, FILE
PHOTO: The Twitter logo is displayed on a smartphone screen in an undated photo illustration.
>

The images are only early-stage mock-ups and not a feature currently being tested within Twitter, a source at Twitter told ABC News.

Robert Mueller's report on Russian influence on the 2016 presidential election showed social media was a prominent way for trolls and bots to influence the electorate.

On March 5, Twitter said the company is planning a series of updates to its platform to target misinformation. These include applying a label to tweets that have been \"have been significantly and deceptively altered or fabricated,\" showing a warning to people before they retweet or like the tweet, and reducing the tweet's visibility, according to a Twitter blog post.

The leaked mock-up images are not a part of that March update, according to a Twitter source.

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