Breaking News:~Apparent smoke bomb tossed at White House~The White House is on "lockdown" after a "smoke bomb like device" was thrown over the north fence.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 was at the scene and described a flash of light just inside the White House grounds. "People scurried away but someone quickly said it was nothing and everyone returned to what they were doing," she said. "It did smell bad like sulfur," she added. advertisement The crowd largely dissipated later in the evening, he said. No arrests were reported.