The EU is calling on eight major tech companies including Google, Facebook and X to detail how they identify and tackle deepfake material amid concerns about the use of the technology to influence elections. In a world first they will be using new laws on artificial intelligence to force companies to root out fake video, imagery and audio. Companies have until 5 April to show how they will deal with last-minute high impact fake news being dumped on social media, amid evidence that foreign agents including those from Russia are building up "sleeper" accounts to be deployed on the eve…