Xie Chaoping, author of a book on relocation criticism, has been released on bail, authorities of Weinan City of northwest China's Shaanxi Province said Friday.

Xie was detained by police for alleged "illegal business activities" regarding the publication of his book on relocation criticism.

Zhang Jing, spokesman of the procuratorate in Linwei District of Weinan City, said Xie Chaoping had been released on bail because "police have not found sufficient evidences supporting the charge."