The United States has urged China to give a full account of the 1989 massacre at Tiananmen Square and release prisoners taken during the protests, a State Department spokesman said. "The time for the Chinese government to provide the fullest possible public accounting of the thousands killed, detained, or missing in the massacre that followed the protests is long overdue," Sean McCormack said in a statement on the eve of the 19th anniversary of what China has called the "June Fourth incident." "We also join others in the international community to urge China to release all those still serving sentences for participating in the nationwide protests," he said, adding that 50 to 200 people are believed to remain behind bars.