From the New York Times (link):
The Chinese president, Hu Jintao, wound up a four-day visit to the United States on Friday with a foreign policy address at Yale that offered an upbeat vision of Chinese-American ties, as the two sides tried to shake off the lingering effects of protocol blunders during the White House reception for Mr. Hu.
The Chinese Embassy in Washington sent a delegation to the White House on Friday to demand a detailed explanation of how an adherent of the Falun Gong spiritual sect, which is banned in China, managed to infiltrate the welcome ceremony for Mr. Hu on the South Lawn of the White House on Thursday and heckle Mr. Hu for several minutes before being escorted away.
See also Washington Post’s “Falun Gong Activist Defiant After Arrest” by Karlyn Barker and Lena H. Sun
The protester who disrupted a White House ceremony for Chinese President Hu Jintao remained defiant yesterday, even after prosecutors charged her with a federal crime punishable by up to six months in jail.
“It’s not a crime but an act of civil disobedience,” Wenyi Wang declared after she emerged from a hearing in U.S. District Court in Washington, drawing cheers from nearly three dozen fellow activists from Falun Gong, a religious sect that is suppressed in China.
Also Washington Post’s editorial “Overreacting to Protest”