'Suspicious substance' being investigated in Dirksen Senate Office Building; Update: 'All clear'

Sen Wyden office MT @SenateSAA: Police activity in in Dirksen #Senate Office Bldg room 221. Staff & other personnel should avoid this area

— Scott MacFarlane (@MacFarlaneNews) February 10, 2014

Outside Dirksen office closed while Capitol Police examine suspicious substance in an envelope. pic.twitter.com/E5H0JTFF5M

— Hannah Hess (@ha_nah_nah) February 10, 2014

Police are investigating a "substance" in Sen. Wyden's office. Press being kept away. http://t.co/nEKKudsvmx

— Ginger Gibson (@GingerGibson) February 10, 2014

! RT @ha_nah_nah: Announcement over speaker system directs all staff to keep #Dirksen hall clear. #CapitolPolice asking reporters to retreat

— jennifer bendery (@jbendery) February 10, 2014

DC fire department on scene where they are investigating a suspicious substance pic.twitter.com/g4at5pwIXB

— Kasie Hunt (@kasie) February 10, 2014

U.S. Capitol Police give the all-clear on a suspicious substance found at the office of Sen. @RonWyden (D-Ore.).

— Ed O'Keefe (@edatpost) February 10, 2014

U.S. Capitol Police give the all-clear on a suspicious substance found at the office of Sen. @RonWyden (D-Ore.).

— Ed O'Keefe (@edatpost) February 10, 2014