The Anti-Terrorist Squad was a part-time unit raised in the 1960s to deal with high risk situations involving armed offenders and possible terrorism related events . Commissioner of Police John Jamieson sent the group in response to the Aramoana massacre in 1990 . They located gunman David Gray and ended his spree . Group member Stephen Vaughan was shot in the ankle during the final shoot-out
Aramoana massacre
Aramoana massacre
Special Tactics Group