He said they had caused enormous loss and hurt and stemmed from a warped and malignant ideology.
His move has raised fears that he could attempt to use the trial to express his extremist views.
Rashid, who was injured in his bid to overpower the attacker, passed away on Saturday.
In a 74-page 'manifesto' the attacker posted online, he described himself as a white supremacist who was out to 'avenge attacks in Europe perpetrated by Muslims'.
'Be assured this is just the beginning of the work we'll be doing'
Ardern outlined that five guns were used by the perpetrator -- who held a gun license -- out of which two were semi-automatic weapons and two were shotguns.
A 16-year-old Singaporean boy, a Protestant Christian of Indian ethnicity, was detained last month under the Internal Security Act (ISA) after planning to use a machete to attack Muslims at two mosques in March, on the anniversary of New Zealand's Christchurch attacks.
Abdul Nazer and Ansi Alibava were inside the Al Noor mosque in central Christchurch when the first shots were fired by a white supremacist.
'The sentiment against immigrants and particularly against Muslims is produced by the climate of hatred and bigotry we see all around us.' 'It is produced by the politics of division and spread by a reckless media around the world including unfortunately in India,' says Aakar Patel.
Forty suspects, including the driver of a van allegedly used by the suicide bombers, have been arrested in connection with the attacks which shook Sri Lanka.