Home Minister P. Chidambaram Saturday said the use of violence as an instrument of protest poses a "big challenge" for the country, besides that from communalism and casteism.
http://ummid.com/news/2011/September/10.09.2011/chidmabaram_on_violence.htm
http://ummid.com/news/2011/September/10.09.2011/chidmabaram_on_violence.htm