The security alert at White House has proved to be a false alarm.
Earlier streets around the complex were cleared by police in a major security operation after a suspect package was found.
The package, which was left at a Pennsylvania Avenue gate, was later found to be harmless.
During the alert President Bush had been left inside the building for his own safety.
Security around the President has been stepped in the run up to the Summit of the Americas in Quebec this weekend. He is due to leave for Canada today.
Environmental protestors are expected to try to disrupt the conference.
Quebec has been turned into a fortress to protect the leaders as they discuss the creation of what would be the world's largest free-trade area.
additional reporting PA