Stocks of major US tech companies have taken a sharp hit following the surprise debut of DeepSeek, a budget-friendly AI chatbot from China. Launched just last week, DeepSeek has quickly surpassed competitors like ChatGPT, becoming the most downloaded free app in the US—despite being developed at a fraction of the cost. However, shortly after US markets opened, DeepSeek reported facing a "large-scale malicious attack."

Disclaimer: This video is taken from BBC News.