Asian stock markets plunged on Friday as a global selloff in technology stocks gathered pace, with South Korea's benchmark KOSPI tumbling more than 8% and triggering a circuit breaker, while Japan's Nikkei slumped nearly 5% amid fears that the artificial intelligence rally may have run too far, too fast.South Korea's KOSPI fell 8.2%, prompting authorities to halt program trading for 20 minutes after steep losses rippled across the market. Japan's Nikkei 225 dropped 5%, while Hong Kong's Hang Seng declined 2.4%. China's blue-chip CSI300 index slipped 2.9% and the Shanghai Composite lost more than 2%. Friday's slump followed another broad-based...