▲ This photo, taken July 16, 2026, shows the dealing room of Hana Bank in Seoul during morning trading hours. (Yonhap)

SEOUL, July 16 (Yonhap) -- Seoul shares again plummeted Thursday, led by steep losses in technology heavyweights, as escalating tensions in the Middle East weighed on investor sentiment. The Korean won rose against the U.S. dollar.

After opening 4.45 percent lower, the benchmark Korea Composite Stock Price Index (KOSPI) extended its losses to close at 6,820.60, down 463.81 points, or 6.37 percent from the previous session, after falling as low as 6,730.87.

The Korea Exchange, the country's bourse operator, activated a sell-side sidecar on the KOSPI for 20 minutes at around 9:10 a.m. after the benchmark index fell more than 5 percent.

The decline came after the index surged 6.24 percent Wednesday as softer-than-expected U.S. inflation data eased concerns about near-term Federal Reserve interest rate hikes.

Adding to investor jitters, the Bank of Korea (BOK) raised its benchmark interest rate by a quarter percentage point to 2.75 percent earlier in the day, the first increase in 3 1/2 years, to curb inflation amid escalating tensions in the Middle East.

The U.S. launched fresh strikes on Iran, escalating tensions in the Middle East and renewing concerns over potential disruptions to regional energy supplies.

Institutional and foreign investors sold a net 2.37 trillion won (US$1.6 billion) and 1.38 trillion won worth of shares, respectively, while retail investors bought a net 3.66 trillion won.

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