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SEOUL, April 18 (Reuters) - The South Korean won fell to a one-week low as anxiety about North Korea hurt sentiment after U.S. Vice President Mike Pence reassured Japan of Washington's commitment to reining in North Korea's nuclear and missile ambitions.
The won was quoted at 1,142.4 to the dollar at the conclusion of onshore trade, down 0.4 percent from Monday's close of 1,137.7 and the lowest closing since April 11.
South Korean shares ended slightly higher on investors' stock purchases as they focused more on first-quarter earnings of local companies and the May presidential election than on North Korea.
The Korea Composite Stock Price Index (KOSPI) closed up 0.1 percent at 2,148.46 points.
Domestic institutions bought a net 38.3 billion won ($33.55 million) of KOSPI shares. Offshore investors also were net buyers by the end of the trade, but the amount purchased was small. (Reporting by Dahee Kim; Editing by Richard Borsuk)