In New Zealand, a gunman killed 49 persons and injured 20 in attacks at two mosques killing 49 people and seriously injuring 20 others in the Christchurch city.
A total of four people - three men and one woman - are now in custody and will appear in court tomorrow.
In addition, police are aware of a video shared online, and broadcast live during the attack, that purports to show a gunman walking into an unnamed mosque and opening fire.
The gunman then walks back into the mosque, where there are at least two dozen people lying on the ground.
Mark Nichols told the New Zealand Herald he heard about five gunshots and that a Friday prayer-goer returned fire with a rifle or shotgun.
Tarrant, who police say carried out at least one of the shootings, posted a jumbled, 74-page manifesto on social media in which he identified himself by name and said he was a 28-year-old Australian and white supremacist who was out to avenge attacks in Europe perpetrated by Muslims.
YouTube content star PewDiePie has issued a response to having his name attached to the New Zealand mosque massacre, saying he was "sickened" by any connection to the incident. Gray also said she recalled that Tarrant's father Rodney died from some kind of asbestos-related illness when Tarrant was finishing high school. It is the busiest day for many mosques around the world when Muslims convene for Friday prayers.
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The horrified YouTuber said on Twitter this morning that he had "just heard news of the devastating reports from New Zealand Christchurch". "At that moment, I realised it was really serious", the man said.
Bush clarified that police had found two improvised explosive devices in one vehicle.
Australia's prime minister Scott Morrison has since confirmed that one of those arrested was an Australian citizen.
Ardern said New Zealand was not a target because it is a safe harbour of those who hate, nor because New Zealand condones racism or is an enclave for racism. He said he was not a member of any organisation, but had donated to and interacted with many nationalist groups, though he acted alone and no group ordered the attack. The CACR found that Muslims immigrants are viewed "less favourably" by New Zealanders. Ardern, whose party campaigned on a promise to take in more refugees, called it "the right thing to do".
"What has happened here is an extraordinary and unprecedented act of violence", she said, adding that the attackers have "no place in New Zealand".
The second attack took place at the Linwood mosque about 5 kilometers (3 miles) away. There will be so many people affected.
"We need to be blind in that regard - we need to absolutely focus on threat and ideology and extremism because obviously, that is what we have experienced today".