The White House was locked down for more than an hour yesterday after two men threw items over the area's north and south fence lines at the same time, the Secret Service said.
Evan J Graham and Vaughn Greenbrier Lerriche were arrested by the Secret Service, NBC News reported.
The object Graham threw has been described as a cassette tape while Lerriche threw what is being calling "miscellaneous papers." Officials do not know if the two incidents are connected.
President Barack Obama is not in Washington DC today as he is on a fund-raising swing in California.
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The lockdown was the second in three days.
On Tuesday, the White House was temporarily locked down after an unauthorised car followed an official motorcade carrying the daughters of the US President.
The sprawling complex briefly went into lockdown after the private car got onto a closed section of Pennsylvania Avenue behind a secure motorcade.
The motorcade was carrying Obama's daughters, Malia and Sasha, back to the White House.
The car was searched by District of Columbia police but nothing was found.