Police said a man in his 20s is in custody and has been charged with murder.
He confirmed media reports that the gunman, who identified himself as Brenton Tarrant and mowed down worshippers in two mosques in the southern New Zealand city of Christchurch, was an Australian-born citizen.
Earlier on Friday, at least 49 people were killed and 20 others seriously wounded in shootings at two mosques in the New Zealand city of Christchurch, in the worst attack in the Pacific country's history.
Authorities also say they found two improvised explosive devices (IEDs) attached to a vehicle.
In the aftermath of the attacks, New Zealand has been placed on its highest security threat level according to Prime Minister Jacinda Ardern.
In the attack - which took place at two mosques in Christchurch, New Zealand, at least 49 people were killed.
National Policing lead for Counter Terrorism, Neil Basu said: "We are monitoring events in New Zealand closely and send our condolences to all those affected".
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Nearly 50 people were treated at Christchurch Hospital for gunshot wounds, including young children. Sources confirmed to CBS News that video livestreamed on social media by the shooter shows the attack in horrifying detail. For many New Zealand was their choice, a place they actively came to and committed themselves to.it was a place where many came to for their safety. One man has been charged with murder following the attacks. Peneha then went into the mosque to help the victims.
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Meanwhile, leaders across the globe responded with outrage after Australian senator Fraser Anning apparently said in a statement shared online that the real cause of the attack was Muslim immigration.
- She said the shootings appeared to have been a well-planned "terrorist attack".
- The 28-year-old Australian described his anti-immigrant motives in a manifesto. It is the second most-populous city in New Zealand behind Auckland and Wellington.
All mosques across the country have been urged to shut their doors, and people have been advised to refrain from visiting these premises until further notice.
He stormed the Al Noor Mosque in Christchurch and opened fire on hundreds of worshippers who were attending Friday prayers. He said victims were a "large group of invaders" who he says "seek to occupy my peoples lands and ethnically replace my own people (sic)". Witnesses said there was much blood and multiple deaths.
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Based on the video, the attacker was at the scene of the first mosque for about 10 minutes, and police did not arrive until after that.
Following the attack, New Zealand cancelled all to and fro flights to Christchurch.
"I never thought in my life I would see something like this", she said.
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