- Associated Press - Friday, April 18, 2014

OLYMPIA, Wash. (AP) - Some Olympia residents say they have been awakened in the overnight hours by a mysterious humming sound.

The Olympian reports (http://bit.ly/1eQFSet) not everyone can hear it and the sound is intermittent.

Attempts to track down the hum have been unsuccessful, although idling trains, pressure washers and heat pumps have been suspected.

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Information from: The Olympian, http://www.theolympian.com

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