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White House in lockdown
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04/24/09 08:49 AM ET
CBS's Mark Knoller says the White House is in lockdown:
No word on the suspected threat.
UPDATE: All better:
markknollerSecurity lockdown at the White House. All reporters and photographers swept off the north grounds and required to stay inside press room.
No word on the suspected threat.
UPDATE: All better:
markknollerAll clear at the White House. Secret Service tells CBS News it was an airspace violation by an aircraft - now landing at a local airport.
