Originally Posted by
johnso29
An unauthorized aircraft
entered restricted airspace over the U.S. Capitol in Washington, DC., Saturday, prompting an evacuation of the Capitol.
The
inbound aircraft, a Piedmont Airlines flight from Hilton Head, S.C., was first spotted in the restricted airspace at 1:30 p.m. As a precautionary measure, buildings were evacuated and secured, said the U.S. Capitol Police in an email.
I think they entered P56.

I don't think they entered P-56. I believe the "restricted airspace" that is discussed in the news item is in reference to the Washington DC Flight Restricted Zone (FRZ).
0/8326 NOTAM Details
Operating in the FRZ without maintaining two-way radio communications would be a big no-no. In a DHC8 coming from the south into DCA, it would be quite difficult to end up north of the Potomac and west of the Anacostia to violate P56. Not impossible, but very difficult.