A lone youth with a Kalashnikov hidden in a beach umbrella who suddenly opens fire on all around him is something that will not show up on electronic surveillance. IS has the ability to recruit young people who have limited or no criminal records and no known terrorist link.
IS is fighting on three fronts; waging guerrilla warfare in Iraq and Syria while seeking to attack Westerners or Shi’ites and others it considers to be apostates in neighbouring countries, and reaching out on social media to disaffected Muslims in the West, inspiring them to attack targets in their home country.
It also continues to devise new atrocities in its so-called caliphate, such as drowning people in a cage or setting off explosives around their necks, after burning alive a Jordanian pilot and numerous beheadings — all filmed with high-end production values and transmitted online.
While there is no need to become paranoid, countries like New Zealand must constantly review their security. In that sense it is not encouraging that a group of Greenpeace protesters was able to scale scaffolding at Parliament last week. These people were harmless — somebody else might not be.