Twitter has tagged a video tweeted by US President Donald Trump for "manipulating the media" for the first time.
The video shows a black boy running away from a white boy while he plays, with a fake CNN caption.
Caption reads: "The terrified child runs from the racist child", before the video accuses CNN of "fake news".
Twitter's decision to put a large warning label on the video is the latest escalation in a row between Twitter and the president.
In late May, Twitter added fact-checking notices to the president's tweets for the first time, followed two days later by hiding tweets behind a warning.
Trump responded by signing an executive order that seeks to curb the long-standing legal protections of social media companies.
- Facebook removes Trump's announcement about the "symbol of Nazi hatred"
- Trump signs sort out giant social media targets
This latest warning is the first time Twitter has used the "manipulated media" warning on one of the president's tweets, designed to indicate that the photo or video has been significantly modified.
It also comes at a time of heightened racial tension in the United States and the revival of the Black Lives Matter movement.
After the initial shot of the children running, another caption appears: "The racist child is probably a Trump voter."
Then cut the text promising "what really happened", showing the original context of the two children at stake - as CNN did in its original report in September last year.
"America isn't the problem. The fake news is," declares the video before it ends.
But clicking on the prominent warning that Twitter attached to the tweet takes users to a page where Twitter warns: "The president shared a version of the video that many journalists have confirmed has been edited and modified with a fake CNN chyron." .
Analysis
By Marianna Spring, reporter specialized in disinformationTwitter has redoubled its efforts to verify President Trump's amplified disinformation in recent weeks.
Previously he had a more practical approach - one that Facebook continues to prefer, although Facebook has removed the advertisements for Trump's campaign that yesterday featured a Nazi symbol.
One problem for Twitter, however, is consistency. It is unclear why some incorrect information promoted by the President of the United States is labeled, while misleading statements by him and other large Twitter accounts are left unchecked.
It is also worth noting that this is a clear attack on CNN. The media organization has often found itself the target of Trump's "fake news" cries. But in recent weeks, his journalists - and those from other outlets - have also been subject to physical attacks during protests sparked by the death of George Floyd.
Here, however, the "fake news" issue obviously comes back to President Trump. It is linking it to its millions of online followers.
CNN's communications department also tweeted to the president with a concise response.
"CNN treated this story - exactly how it happened. Just like we reported your positions on the race (and on the poll numbers)," he wrote.
"We will continue to work with facts rather than tweeting fake videos that exploit innocent children. We encourage you to do the same. Be better."
A watermark on the video in the president's tweet indicates that it was originally created by a pro-Trump Twitter user named Carpe Donktum.
"Thanks to CNN, you gave my video three of the top 20 (two top five) trend spots," he wrote. "I haven't had so much fun since you went crazy for the Time Magazine cover!"
