The breach happened at about 11:38 pm yesterday. President Donald Trump was at the White House.
The agency says the individual, whom it did not identify, was arrested without further incident. No hazardous materials were found during a search of a backpack the individual carried.
The Secret Service also says a search of the south and north grounds of the White House complex found "nothing of concern to security operations".
Homeland Security Secretary John Kelly was briefed on the incident.
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