A screen in Hana Bank's trading room in central Seoul shows the Kospi and the dollar-won exchange rate on the afternoon of June 4. The Kospi closed at 8,639.41, down 162.08 points, or 1.84 percent, from the previous session, its first lower close since May 28. [YONHAP]

The won weakened sharply against the dollar on Thursday due to renewed tensions in the Middle East as the United States and Iran engaged in a fresh round of airstrikes.

The won traded at 1,529.7 to the dollar at 3:30 p.m., weaker by 13.3 won from the previous session.

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