Philip Arps had also made a modified version of the video that he intended to share as a meme.Read more
Prince William has visited a mosque in Christchurch where 42 people were killed in March's shootings.
Ms Ardern has been addressing the New Zealand parliament over a proposed ban on all types of semi-automatic weapons and assault rifles following the Christchurch attacks. "These weapons were designed to kill, and they were designed to maim and that is what they did on the 15th of March," Ms Ardern said.
Crowds gather at a park in the city for a service to honour the 50 victims of the 15 March attacks.