Here is the message from Michael Jennison (FAA) from this past Friday:
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I may have seen this bird this morning. From half a block 
>away, I saw a big accipiter wheeling into a tree in front of the FTC at

>6th and Constitution NE at 8:45. I was able to pull up right below it. 
>I didn't even occur to me at the time that it could be a Goshawk. It 
>was large for a Cooper's (the size of a Red-tail and substantially 
>bigger than the Rock Pigeons nearby). Lots of dark streaking on the 
>underparts. Unfortunately, I had no camera or binoc; should have tried 
>a shot with my cell phone. I will walk over there at lunch to see if it

>is still around. Feel free to post this to the MDOsprey list (I just 
>lurk; I'm not a member). Regards, Michael
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Jim

Jim Felley
Smithsonian Institution