The White House is on lockdown for the second time this week after two items were thrown over the north fence and the south fence at the same time, the Secret Service said Thursday.
The two people who threw the items are in custody and are being questioned, NBC's Los Angeles affiliate reported.
The Secret Service is trying to determine if the items are dangerous.
President Obama is currently in California.
Secret Service officers were ordering people in the West Wing to stay inside.
The incident follows an hourlong lockdown Tuesday after a vehicle followed a motorcade bringing the president's daughters home through the gates. The driver was charged with unlawful entry, a misdemeanor, the Associated Press reported.
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