Tarrant was arrested along with three other individuals, two men and one woman.
Officers also discovered explosive devices in a auto, which were defused. Police are trying to determine to what extent, if any, they were involved in the attack. "I blame these increasing terror attacks on the current Islamophobia post-9/11", Pakistani Prime Minister Imran Khan posted on social media.
Pakistan's Prime Minister Imran Khan echoed those sentiments.
The Muslim Students' Association has also spoken out about the attack on Facebook.
The man who claimed responsibility for the shooting said he came to New Zealand only to plan and train for the attack.
National carrier Air New Zealand canceled at least 17 flights in and out of Christchurch, saying it couldn't properly screen customers and their baggage following the shootings.
"The European Union will always stand with #NewZealand and against those who heinously want to destroy our societies and our way of life", he wrote. "Lots of love for our Muslim brothers" read a handwritten card on a wall of flowers in a historic part of the city that stretched a full block.
London's mayor, Sadiq Khan, said the city's Metropolitan Police force would be visible outside mosques.
Whether in the form of "lone-wolf" or coordinated attacks, in yesterday's shooting we see analogues not only in the terrorism against Muslims in the Quebec and Finsbury Park mosque attacks, but in the terrorism against Jews in Pittsburgh, against African-Americans in Charleston, and even against the concept of multiculturalism itself in the 2011 Norway attacks.
Mr Bainimarama also said his government will be working closely with authorities in New Zealand to monitor the welfare of Fijians in Christchurch.
"Today we stand in solidarity with the Muslim community and stand up against growing racism and hatred around the world", said FSWC president Avi Benlolo.
The Ontario police forces say they have not received reports of threats or suspicious activity at local places of worship, but say there will be a "heightened police presence" around the facilities in the coming days. Political and Islamic leaders across Asia and the Middle East voiced concern over the targeting of Muslims. She asserted that New Zealand "will not and can not be shaken" by this attack. In a Friday tweet, he also criticized the West for "defending demonization of Muslims as 'freedom of expression'". His office said on Twitter that Israel mourns the murder of innocent worshippers, condemns the assault and sends its condolences to bereaved families.
It was by far the deadliest shooting in modern New Zealand history.
One man who said he was at the Al Noor mosque told media the gunman was white, blond and wearing a helmet and a bulletproof vest. In a comparison to other 177 countries in 2007 that looked at the rate of private gun ownership, New Zealand ranked 22nd.