He has not been officially named, but Australian Prime Minister Scott Morrison said he was an Australian citizen, and described him as "an extremist, right-wing, violent terrorist". It is the second most-populous city in New Zealand behind Auckland and Wellington.
He stated: "New Zealand, like Australia, is home to people from all faiths, cultures and backgrounds".
"You may have chosen us but we utterly reject and condemn you".
Mohammed Shafiq of the Ramadhan Foundation said the attacks were by far right extremists "inspired by their hatred of Muslims and Islam".
Journalist Chris Lynch, a radio host on New Zealand station ZB Radio, told CNN that one of the shootings had occurred at "the biggest mosque in all of Christchurch".
Bush said that police had also defused 'a number of IEDs (explosive devices) attached to vehicles'.
"London stands with the people of Christchurch in the face of this horrific terror attack", he said.
According to the "manifesto" published online and spread on social media before being deleted hours later, he said he was disappointed with the plunging fertility rates of people of European descent and the higher fertility rates among immigrants, explaining that the goal of his brutal attack was to incite fear and divide society. And the one that we place the currency on right now is our compassion and support for the community of those directly affected by this tragedy. "Our thoughts & prayers are with the families of the victims", Gargash wrote.
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Low-priced airline Norwegian Air Shuttle, South Korea's Eastar Jet and South Africa's Comair also said they would halt flights. Air Canada, for example, announced it was canceling flights to London following Britain's decision to ban the aircraft.
Police are seen in front of Christchurch Hospital during a lockdown on March 15, 2019 in Christchurch.
"I saw dead people everywhere".
And West Suffolk MP Matt Hancock, who is also health secretary, Tweeted: "Desperately shocked at the very bad terrorist attack on New Zealand mosques". "It looks as though the worst has happened", she said.
"An attack against peaceful people gathering for prayer is shocking in its cruelty and cynicism", Russian President Vladimir Putin said.
The Queen said in her message: "I have been deeply saddened by the appalling events in Christchurch today". "They have chosen to make New Zealand their home and it is their home".
The situation was also considered as not limited to Christchurch and Bush asked "anyone who was thinking of going to a mosque anywhere in New Zealand today not to go".
British Prime Minister Theresa May offered deepest condolences "after the horrifying terrorist attack in Christchurch".
"I particularly want to express my honest prayers and thoughts for those New Zealanders, indeed Australians of Islamic faith today, who have been the subject of this callous right-wing extremist attack".
"We must link arms around the world to stand up against this evil".
Javed Dadabhai, who flew from Auckland after learning about the death of his 35-year-old cousin Junaid Mortara, said the Muslim community was being patient.