WASHINGTON -- Someone threw what appeared to be a smoke bomb over the White House north fence Tuesday night, according to the Secret Service. The White House was locked down while authorities investigated.
The incident took place at the same time a rally was going on outside the White House.
About 1,000 protesters from the Occupy DC movement marched from Capitol Hill to the White House, Secret Service public affairs officer George Ogilvie told NBC News.
The crowd largely dissipated later in the evening, he said.
No arrests were reported.
NBC
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