Stock markets fell Friday on renewed fears of an AI bubble, a weak US job market and a prolonged US government shutdown.

Wall Street opened lower, with shares in US chips designer Nvidia down 1.6 percent and fellow tech giant Palantir shedding 0.5 percent after a selloff the previous day.

"It's one thing for equity markets to suffer a general pullback, as happened during the Trump Tariff Tantrum in April," said David Morrison, analyst at Trade Nation financial services firm.

"But it's quite another to see stocks at the vanguard of AI development getting trashed. What adds to concerns is that there has been no obvious catalyst for the selloff," he added.

Massive investments in artificial investments have fuelled a tech rally this year, but some investors fear the valuations are now far

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