DOT (Department of Transportation) called it in to the Oregon State police. The object "appeared to resemble a fire extinguisher with black tape on it."
According to the newspaper The Register-Guard, the authorities aren't revealing much:
As to what the object could possibly have been, or why police were so concerned, they wouldn't say. Nor would they disclose where the bomb squad took it for analysis.
It's acknowledged they bomb squad "never" reveals where they take their suspicious devices to be analyzed, but the silence on the object itself is interesting, as is this comment from State Police spokesperson Gregg Hastings:
"We don't want other people making similar devices."
You can view a clip of the robotic device inspecting the object here.