the conflict". Level of threat The Security Intelligence Service (SIS) stated in its 2006 report that "the risk of a terrorist attack on New Zealand or New Zealand interests is low", but also warned against complacency. It has stated that there are individuals in New Zealand linked to international terrorism, although the Green Party and others have dismissed these claims. Once identified as a threat to New Zealand, Ahmed Zaoui became a citizen. In another case, a man named Rayed Mohammed Abdullah Ali was deported from New Zealand after being linked to the hijacker of American Airlines Flight 77 which hit the Pentagon on 11 September 2001. In response to the Christchurch terrorist attacks of 15 March 2019, the country's threat level was temporarily raised from "low" to "high" and was later lowered to "medium" on 17 April 2019. List of notable incidents Most attacks, or attempted acts, of terrorism in New Zealand have been bombings as a form of protest. Huntly rail bridge bombing On 30 April 1951, during an industrial dispute, a rail bridge three miles from Huntly, on the Glen Afton branch line, was dynamited. Although the morning passenger train ran over the damaged bridge, it did not collapse. After regular railway line patrols were commenced, trains ran normally again the next day. Sidney Holland, the Prime Minister of the time, called it an "infamous act of terrorism". Academic Lance Beath writes that the bombing might not be considered a "terrorist" incident because there was no intent to kill or injure people and the only objective was blocking supplies. Though author Len Richardson accepts the police assessment that the explosion was intended to intimidate open-cast mineworkers. Ward bomb killing Dunedin lawyer James Patrick Ward was killed by a parcel bomb sent to his office on 5 February 1962. Ward suffered heavy injuries to his chest and right arm, with his left hand being blown off, after several operations at Dunedin hospital Ward failed to recover from his injuries. The explosion also destroyed his desk and the exterior facing window of his office. The police never solved the crime and described it as "one of the most callous murders in the history of New Zealand crime." Vietnam War protests In 1969–70 there were multiple bombings and attempted bombings of military bases and other sites related to the New Zealand military. The bombings were in protest against New Zealand's