 The counter-terrorism capabilities of the Police have been expanded in response to the 11 September attacks in the United States, and counter-terrorism also takes up a significant proportion of the SIS's budget.One observer has argued that New Zealand "already had in place a very comprehensive set of counter-measures" before that point.Seventeen people were arrested in co-ordinated raids on 15 October 2007 by Police Armed Offenders Squads and Special Tactics Group.