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WASHINGTON, July 2 (Reuters) - A U.S. warship sailed near a disputed island in the South China Sea claimed by China, Taiwan and Vietnam on Sunday in an operation meant to challenge the competing claims of all three nations, a U.S. Defense Department official said.

The U.S.S. Stethem, a guided-missile destroyer, sailed within 12 nautical miles of Triton Island, part of the Paracel Islands in the South China Sea, the official said.

The operation was first reported by Fox News on Sunday.