- 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 (https://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.


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

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