WASHINGTON, July 23 (Reuters) - A 6.4 magnitude earthquake hit off the coast of Russia's Kuril Islands in the northern Pacific, the U.S. Geological Survey reported on Wednesday.

The quake was centered 66 miles (106 km) east-northeast of Severo-Kuril'sk and hit at 0143 GMT on Thursday. USGS said it was at a depth of 21.7 miles (35 km). There was no tsunami warning issued.

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