The Chinese doctor who exposed the country's Sars cover-up last year has disappeared in what is believed to be part of a government crackdown on potential dissidents before today's 15th anniversary of the Tiananmen Square massacre.

Jiang Yanyong, who is also a leading democracy campaigner, was reported missing along with his wife by their daughter yesterday.
http://www.guardian.co.uk/china/story/0,7369,1231128,00.html