Bush asked to lobby for professor's release

Human Rights Watch has called on US president George W. Bush to use this week's summit with Chinese president Jiang Zemin to press for the release of historian Xu Zerong. He was jailed earlier this year for sending 1950s material on the Korean war to researchers outside China.

Professor Xu is a Chinese national and resident of Hong Kong, who taught at Guangzhou University after completing his graduate studies at Oxford University.