The breach happened around midnight on March 10 while President Donald Trump was in the building, the agency said.
The intruder was arrested without incident and no hazardous materials were found in the backpack.
President Trump and Homeland Security Secretary John Kelly were briefed on the incident.
According to the Secret Service, agents searched the grounds and found “nothing of concern to security operations”.
Intruders have broken into the grounds of the White House before by scaling the perimeter fence. They are usually handed over to local police.
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