There is a photo of the specific person being sought in connection with the shooting on the linked news story below.
http://www.cbc.ca/news/world/story/2011/11/16/white-house-bullet-found.html
http://www.cbc.ca/news/world/story/2011/11/16/white-house-bullet-found.html
Secret Service says bullet hit White House
The Associated Press
Posted: Nov 16, 2011 10:16 AM ET
Last Updated: Nov 16, 2011 10:47 AM ET
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The U.S. Secret Service says it has found a bullet that hit an exterior window of the White House and was stopped by ballistic glass.
An additional round of ammunition was found on the exterior of the White House. The bullets were found Tuesday.
A spokesman for the Secret Service, Edwin Donovan, declined to answer additional questions about the incident including the calibre bullets recovered or what room of the White House was behind the window that was hit, citing an ongoing criminal investigation.
The discovery follows reports of gunfire near the White House on Friday. Witnesses heard shots and saw two speeding vehicles in the area. An assault rifle was also recovered.