The woman began shouting from the top of a camera stand that was located directly in front of the two leaders so that news photographers could record the arrival ceremony on the south lawn of the White House.(Thanks to Crooks and Liars and Attytood for the tip.)
She shouted in heavily accented English, "President Bush: Stop him from killing" and, "President Bush, stop him from persecuting the Falun Gong."
Bush, standing next to Hu, leaned over and whispered a comment to the Chinese leader, who paused briefly when the shouting began and then resumed his remarks.
The protester was waving a banner with the red and yellow colors used by Falun Gong, a banned religious movement in China. She kept shouting for several minutes before Secret Service uniformed agents were able to make their way to her position at the top of the camera stand. They dragged her off the stand.
A photographer who was standing next to the protester tried momentarily to quiet her by putting his hand in front of her mouth.