I was going to say I'd bet there just about everyon would
be investigating. This confirms what I was going to say,
I guess:
"The investigation was being led by the D.C. Metropolitan Police homicide branch in conjunction with the FBI and Secret Service. Also assisting were Capitol Police, the Bureau of Alcohol, Tobacco and Firearms and the Justice Department. "
So officially it was the Secret Service, Justice, MPDC, FBI and ATF.
Surely the NSA and CIA would also be taking an interest in how
a murder ocurred at the capitol and why.
Also of course other agencies known by initials were doing their best to investigate, agencies like CBS, NBC, and CNN.

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