Benchmark index plummets as much as 12.2 percent, eclipsing single-day plunge after 9/11 attacks in 2001.

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South Korea’s stock market has suffered its steepest fall in history amid the widening fallout of the United States-Israeli war on Iran.

The benchmark KOSPI index plummeted 12.06 percent on Wednesday, eclipsing the 12.02 percent single-day plunge triggered by the September 11, 2001 attacks on the US.