US chip-maker Nvidia led a rout in tech stocks after the emergence of a low-cost Chinese generative AI model that could threaten American dominance in the fast-growing industry. The programme has shaken up the tech industry and hit US titans including Nvidia, the AI chip juggernaut that saw nearly $600 billion of its market value erased, the most ever for one day on Wall Street. $1 trillion was wiped off US stocks as DeepSeek dealt with a cyberattack. Palki Sharma brings you all the latest developments.