Senator Abetz asked the Minister representing the Minister for Immigration and Citizenship, upon notice, on 30 May 2011: (1) Since 1 January 2008, for each centre: (a) what incidents of violence have there been; (b) on what date did they occur; and (c) what injuries were suffered by: (i) detention centre staff, and (ii) other detainees (2) Were the perpetrators of the violence identified; if so what action, if any was taken against them