Final Update: The two-hour ordeal seems to be over with one security guard dead, the perpetrator and one policeman wounded. The incident apparently happened following a domestic argument between a man and a woman and apparently had nothing to do with the Census Bureau.
Details may be found in a Washington Post article at http://goo.gl/D7YtVa.
Update #2: Washington, D.C. police say the suspect who shot the Census Bureau headquarters guard also led police on a chase through the District of Columbia, firing at police on the wild trip. The suspect was eventually shot by police and reportedly was seriously wounded.
The incident reportedly started as an armed kidnapping. Police are now piecing together the details.
Update #1: FBI spokeswoman Amy Thoreson said the incident at the Census Bureau headquarters has “ended” and a loudspeaker announcement declared the all-clear at the facility.
Other authorities say a suspect was shot on H Street NE in the District after a dramatic chase and shootout there.