From the Seattle Times:
In the Seattle area, the first device was found Tuesday by a Woodinville Public Works Department crew working on a railroad trestle over Highway 202, said Woodinville Police Chief John McSwain.
“Public Works found it and took it down and didn’t even bother to call us” because the device didn’t appear to be threatening, he said.
When news of events in Boston began to be reported Wednesday, he said, the Seattle Police Department called and passed on the information about the locations of other devices.
McSwain and other officers removed three more of the devices from various locations, including an awning at a business, in a mini-mall and in front of another business.