'What words adequately express the pain and suffering of 50 men, women and children lost, and so many injured?' asked New Zealand prime minister Jacinda Ardern during her address at a memorial service for the Christchurch victims. 'I thought there were none. And then I came here and was met with this simple greeting.

As-salaam Alaikum. Peace be upon you.' She says those words 'have left us humbled, and they have left us united. Adern was speaking at the National Remembrance Service in North Hagley Park in Christchurch, New Zealand to remember the 50 people killed in the Christchurch mosque shootings on 15 March