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On Monday, officers rifled through tents and tarps but “did not say a single world to anybody,” protester Barry Knight, 43, said.

In the last shooting at the White House, a Colorado man sprayed the mansion with at least 27 semiautomatic rifle bullets in 1994. Francisco Martin Duran was convicted and sentenced to 40 years in prison for the shooting.

• Meredith Somers contributed to this article, which is based in part on wire service reports.