A prominent Chinese rights lawyer has been formally indicted on charges of fanning ethnic hatred and provoking trouble, more than one year after he was taken into police custody.

A Beijing prosecuting office said Friday that Pu Zhiqiang posted online comments that fanned ethnic hatred and that he had insulted people in a disruption of social order. Pu was taken away last May shortly after he attended a private meeting commemorating the 25th anniversary of a bloody crackdown on pro-democracy demonstrators in Beijing's Tiananmen Square.

Earlier this month, the U.S. State Department called for Pu's release, and Beijing told Washington not to interfere with China's judicial affairs.

The charges largely stem from postings in which Pu questioned China's ethnic policies and criticized some public figures.