U.S. Capitol Police gave the all-clear after investigating a "suspicious substance" at Sen. Ron Wyden's office on Capitol Hill Monday.
The Senate Sergeant at Arms office tweeted: "Capitol Police have cleared the suspicious substance in Dirksen-221. The area has reopened. Thanks for your patience and cooperation."
A hazardous materials team was on the scene at the office in the Dirksen Senate Office Building.
Wyden is a Democrat from Oregon.