From White House correspondents:
Secret Service agents urgently clear reporters from White House North Lawn & tourists from Penn Ave.
— Peter Alexander (@PeterAlexander) December 4, 2013
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Security lockdown on north grounds of WH. Routine procedure for when an unattended package is found.
— Mark Knoller (@markknoller) December 4, 2013
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Secret Service says individual arrested for throwing object over the fence onto the WH grounds. Object under investigation.
— Mark Knoller (@markknoller) December 4, 2013