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 5. The Kospi closed at 8,160.59, down 478.82 points, or 5.54 percent, that day from the previous session. [YONHAP]

Stocks dipped by more than 5 percent as investors locked in profits from a recent tech-led rally while monitoring uncertainty over U.S.-Iran peace negotiations. The local currency weakened sharply against the dollar.

The benchmark Kospi lost 478.82 points, or 5.54 percent, to close at 8,160.59, retreating for a second consecutive session.

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The Korea Exchange triggered a sidecar, or a temporary halt in program trading, for the Kospi, which opened 3.66 percent lower, for five minutes at 9:08 a.m. after the Kospi 200 Futures index fell 5 percent or more for at least one minute.