In Scotland, the shooting of 16 students and a teacher in March 1996 prompted the banning of private ownership of handguns in the United Kingdom, and after the Port Arthur massacre where 35 people were killed in a series of shootings, Austrailia enacted widespread tightening of gun laws.
"What has happened in Christchurch is an extraordinary act of unprecedented violence".
"It is clear that this can now only be described as a terrorist attack", Ardern said earlier on Friday, noting that numerous victims could be migrants or refugees.
In a brief statement on Twitter this morning, the prime minister said Canadians join New Zealanders and Muslim communities around the world in grieving.
That said, the two countries are dramatically different in size, with New Zealand having a population of less than 4.8 million people while the US has an estimated 327.2 million people, but the gun violence rates are notably different when looked at with comparitive sizes.
The gunman livestreamed the attack on Facebook and posted a manifesto that was filled with anti-immigrant, white supremacist and Islamophobic rhetoric. Worshippers, possibly dead or wounded, lay on the floor, the video showed. Reuters was unable to confirm the authenticity of the footage.
Police later said one of the arrests didn't relate to the shootings.
The gunman targeted the men's prayer room in the mosque and then moved to the women's room.
Police did not immediately say whether the same person was responsible for both shootings.
He said he and others escaped by breaking through a glass door.
PITTSBURGH (KDKA/CBS) - The Pittsburgh Department of Public Safety says there will be increased patrols at local mosques in response to the shootings in New Zealand.
Speaking to reporters at the signing for his first veto, which struck down an attempt to reject his national emergency declaration, Trump spoke about the shooting carried out at two mosques in Christchurch, New Zealand.
Ardern said 30 people were killed at the Al Noor mosque, the city's main mosque, and another 10 at a mosque in the suburb of Linwood.
She said questions must also be asked on how the 28-year-old Australian citizen was able to enter New Zealand. "They may even be refugees here", Prime Minister Ardern reportedly said.
The online video footage, which appeared to have been captured on a camera strapped to the gunman's head, showed red petrol canisters in the back of his auto, along with weapons.
New Zealand, with 5 million people, has relatively loose gun laws but few gun homicides.
The visiting Bangladesh cricket team was arriving for prayers at one of the mosques when the shooting started but all members were safe, a team coach told Reuters.
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