The US Secret Service has bolstered security at the White House after a man was arrested making threats at one its checkpoints, a third such security scare in just over a week. "On March 18, 2017 at approximately 11:05 pm, an individual drove a vehicle up to a Secret Service checkpoint located at 15th Street and E Street NW," a Secret Service spokesman said in the latest of a series of White House security concerns. "Upon contact with the individual, US Secret Service Uniform Division Officers detained the individual and declared his vehicle suspicious.



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