Conversation so far:
What dentention was Chen Guangcheng involved in?
On 7 September 2005, Chen Guangcheng was reportedly abducted by security agents from Linyi and held for 38 hours in Beijing.
What became of the 2005 Beijing detention of Chen Guangcheng?
After Chen Guangcheng refused to cease his activism, Linyi authorities placed him under house arrest. When he attempted to escape in October, he was beaten.

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