White House Placed on Lockdown After Object Thrown Over Gate

WASHINGTON (AP) -
U.S. Secret Service members block Pennsylvania Avenue in front of the White House  during the lockdown on Monday. (Reuters/Yuri Gripas)
U.S. Secret Service members block Pennsylvania Avenue in front of the White House during the lockdown on Monday. (Reuters/Yuri Gripas)

The White House has been placed on lockdown after a woman threw something over the north fence along Pennsylvania Avenue.

Reporters were not allowed to venture out of the White House press room and a call to the Secret Service was not immediately returned.

Emergency vehicles in front of the White House. (Reuters/Yuri Gripas)
Emergency vehicles in front of the White House. (Reuters/Yuri Gripas)

The woman was arrested. Fire trucks and a hazardous materials response unit were called to the scene. It is common for officers to sweep the grounds after such incidents to ensure nothing dangerous was thrown over the fence.

The lockdown ensued shortly after President Barack Obama returned from delivering a Memorial Day speech at Arlington National Cemetery.