WASHINGTON, Dec 26 (Reuters) - A powerful magnitude 6.5 quake hit off Alaska's Aleutian Islands on Wednesday, the U.S. Geological Survey said, but it did not immediately trigger a tsunami warning.

The quake, only 20.5 miles (33 km) deep, struck at 2204 GMT 31 miles (50 km) southeast of Nikolski, on Umnak island.

The Pacific Tsunami Warning Center did not immediately issue a tsunami warning. (Reporting by Sandra Maler, Editing by Howard Goller)

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