http://farm1.static.flickr.com/4/9545422_f940c507d1_m.jpgA Chinese-born Australian activist has been missing for more than a day after making a one-man protest in Shanghai, a campaign organiser says.

The man, Zhang Xiaogang, had changed his name to get into the country because of a ban.

Mr Zhang had videotaped a one-man protest at the site of the Shanghai World Expo before his disappearance.