The emergence of low-cost AI chatbot DeepSeek has caused shockwaves on Wall Street, with Nvidia losing more than $500bn in market value
Shares in other major US technology firms have fallen steeply in value since markets opened on Monday
The DeepSeek app, which was launched last week, has overtaken rivals including ChatGPT to become the most downloaded free app in the US
Shortly after US markets opened, DeepSeek says it was hit with a "large-scale malicious attack"...
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