AI worries weigh on Wall Street; global markets mixed

Alphabet's share drop stoked AI concerns, pulling S&P 500 futures down 0.8% while the Nikkei fell 2.1% and South Korea's Kospi 3.5%, with SK Hynix and Samsung Electronics slipping; Hong Kong's Hang Seng rose 1.5%. The Bank of Japan held rates at 1.25%.

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