"He sought many things from his act of terror, but one was notoriety - that is why you will never hear me mention his name", Ms Ardern said in an emotional address at New Zealand's parliament.
Earlier, the world's tallest building - the 829m-high Burj Khalifa in Dubai - was lit up with an image of a hijab-clad Ardern hugging a woman in the wake of the killings, along with the words salaam, and its English translation, peace.
The attack came as crime monitoring group Tell Mama said that the number of anti-Muslim hate incidents reported across Britain increased by almost 600 per cent in the week after the terrorist attack in New Zealand. Thank you to the New Zealand Prime Minister for your leadership among all the people of New Zealand and to show love towards the Muslim community.
The gunman in the New Zealand massacre called himself a white nationalist and referred to President Donald Trump as "a symbol of renewed white identity".
New Zealand will hold a national remembrance service for victims of the Christchurch massacre on March 29, the government announced on Sunday, as the country grieves over a tragedy that shocked the world.
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Brenton Tarrant, a 28 year-old Australian man, was arrested within minutes of the attack and has been charged with murder. New Zealand police said on their website a "transitional period" would allow people to turn in their guns without penalty.
Saudi King Salman said, "The heinous massacre of the safe worshipers of mosques in New Zealand is a terrorist act and underlines the responsibility of the global community to confront the rhetoric of hatred and terrorism, which is not recognised by religions or values of coexistence among peoples".
She said: "Our history changed forever".
Hair stylist Gemma Skye Woods was quoted as saying, "At work in our hair salon today took part in #headscarfforharmony we are from #Christchurch, NZ and our hearts broke when the attacks happened last week on our mosques". At Al Noor, the small groups of visitors removed their shoes and socks and knelt down at a garden tap to wash their feet and faces in ritual pre-prayer ablutions. "But he will, when I speak, be nameless".