File photo of riot police arresting a protester during a protest against the plans to expand a petrochemical plant in Ningbo, Zhejiang province

 
File photo of riot police arresting a protester during a protest against the plans to expand a petrochemical plant in Ningbo, Zhejiang province
Riot police arrest a protester during a protest against the plans to expand a petrochemical plant in Ningbo, Zhejiang province in this October 27, 2012 file photo. REUTERS/Carlos Barria/Files