Conversation so far:
what dentention was Chen Guangcheng involved in?
the Chinese government, stated that on 5 February 2006, Chen instigated others "to damage and smash cars belonging to the Shuanghou Police Station and the town government.
what became of this?
Chen was removed from his house in March 2006 and was formally detained in June 2006 by Yinan county officials.

Question: why was he detained by Yinan county officials?
Self-contained rewrite: why was Chen Guangcheng detained by Yinan county officials?