After some time he lost sight of the gunman, and advised the detective to warn everyone to be alert. Anderson spotted Gray coming out the front of his property and issued a challenge, at which the gunman retreated quickly, passing through the rear of his property. Taking cover in the sand dunes of a neighbouring crib, Guthrie encountered Gray coming out of the darkness. Yelling at the gunman to surrender, he fired a warning shot. Gray shouted, "Don't shoot!", leading Guthrie to believe he was surrendering. However, Gray suddenly fired several times, one shot striking Guthrie in the head, killing him instantly. Minutes later the Dunedin branch of the AOS began to arrive and sealed off the township with a roadblock about 250 metres along the only road out of Aramoana, securing it with an armoured car. AOS units from Christchurch, Timaru, and Invercargill were called in for support. The situation was considered dangerous as Gray had a scoped rifle, making him potentially accurate at long range. By this point, the police had ordered that Gray was to be shot on sight – without a warning shot. Anti-Terrorist Squad Commissioner of Police John Jamieson authorised the Anti-Terrorist Squad (ATS) (now known as the Special Tactics Group (STG)), the specialist counter terrorist unit, to travel to Dunedin and locate Gray; group members were in Christchurch, Wellington and Auckland. Unable to get transport with the Air Force, the group caught the early morning business flight on the 14th. They took Heckler & Koch MP5 submachine guns, encountering some problems taking firearms on a commercial aircraft. Also on the flight were Minister of Police John Banks, the Commissioner, and Julie Holden, who described Aramoana to the ATS. A large number of reporters met the flight on arrival at Dunedin. A bus took the ATS to Port Chalmers, which was choked with vehicles, where residents from Aramoana briefed the group about the township and Gray. ATS members took a reconnaissance flight over the township in an RNZAF UH-1H Iroquois helicopter. The helicopter initially flew high as it had no armour protection from small arms fire; Gray had shot at a private news helicopter earlier that morning. The crew of the Air Force Iroquois then carried out low, slow passes over areas of bush where Gray was believed to be hiding, carrying armed police and dropping tear gas grenades as it did so, in an