Fake videos have become a rising trend, a videos has now gone viral in which two of India's A-lister Bollywood actors are seen criticizing Prime Minister Narendra Modi and asking people to vote for the opposition Congress party in the Lok Sabha elections.

In a 30-second video that shows Aamir Khan and another 41-second clip of Ranveer Singh, the two Bollywood actors purportedly say Modi failed to keep campaign promises and failed to address critical economic issues during his two terms as prime minister.

Both AI-generated videos end with the Congress election symbol and slogan: "Vote for Justice, Vote for Congress".

The two videos have been viewed on social media more than half a million times since last week, a Reuters review shows.

Their spread underlines the potential role such AI (artificial intelligence)-generated content can play in the mammoth Indian election that started on Friday and will continue until June.

AI and AI-generated fakes, or deepfakes, are being increasingly used in elections all over the world, including in the US, Pakistan and Indonesia.

This year's general election is the first elections in which AI is being used.

Congress spokesperson, Sujata Paul, shared actor Singh's video with her 16,000 followers on X on April 17 and by Saturday afternoon, her post had been reshared 2,900 times, liked 8,700 times and received 438,000 views.

Paul told Reuters by telephone she was aware the video was marked "manipulated media" by X, but she did not want to delete it as, while posting, she thought the person was a look alike of Singh and "it has creativity for sure".

The post was no longer visible on X on Sunday, hours after Reuters sent a request for comment to Congress' head of social media cell, who did not respond.

Both actors have said the videos are fake. Facebook, X and at least eight fact-checking websites have said they are altered or manipulated, which the Reuters digital verification unit has also confirmed.

Reuters could not ascertain who created videos. Khan was "alarmed" by viral "fake" video and Singh's team was looking into the matter, Singh wrote on X on Friday: "Beware of deepfakes, friends".