According to authorities, a shooter appeared to livestream video of the attack on Facebook, documenting the attack on Facebook from the drive to the Al Noor Mosque from a first-person perspective, and it showed the shooter walking into the mosque from the vehicle and opening fire.
"Police alerted us to a video on Facebook shortly after the livestream commenced and we quickly removed both the shooter's Facebook and Instagram accounts and the video", Facebook tweeted.
"We're also removing any praise or support for the crime and the shooter or shooters as soon as we're aware", Facebook said.
Mia Garlick of Facebook's New Zealand policy team said the social network was working to prevent repostings of the violent video.
The live footage of Friday's attacks, New Zealand's worst-ever mass shooting, was first posted to Facebook and has since been shared on Twitter, Alphabet Inc's YouTube and Facebook-owned Whatsapp and Instagram. In response, YouTube said it's "working vigilantly to remove any violent footage".
Politicians in multiple countries said social media companies need to be more vigilant. Police said a fourth person was arrested Friday but that was "not related to these events".
"While Google, YouTube, Facebook and Twitter all say that they're cooperating and acting in the best interest of citizens to remove this content, they're actually not because they're allowing these videos to reappear all the time", Lucinda Creighton, a senior adviser at the Counter Extremism Project, an global policy organization told CNN.
All platforms encourage reporting such videos.
Christchurch mosque massacre: ICC supports cancellation of NZ-Bangladesh Test
Bangladesh's cricket team escaped unscathed after a shooting at a mosque in central Christchurch , an official told AFP on Friday. According to Alam, the tri-series in Ireland ahead of the May 30-July 14 World Cup "is on track at this point in time".
Tata Motors’ JLR recalls 44,000 cars over Carbon dioxide emission levels
Physical repairs will be needed on some, while others will only need their software updated. This story has been published from a wire agency feed without modifications to the text.
Indian Wells: Rafael Nadal withdraws from Roger Federer semi-final
Federer has received a bye straight to the final, where he will face Dominic Thiem after he beat Milos Raonic in the other semi-final.
Researchers and entrepreneurs specializing in detection systems said they were surprised that users in the initial hours after the attack were able to circumvent Facebook's tools.
The video footage, posted online live as the attack unfolded, appeared to show him driving to one mosque, entering it and shooting randomly at people inside. Many shooting games allow players to toggle between close-range and long-range weapons, and the gunman switched from a shotgun to a rifle during the video, reloading as he moved around.
People who wanted to spread the material had raced to action, rapidly repackaging and distributing the video across many apps and websites within minutes.
Facebook, YouTube and other social-media platforms are struggling to scrub offensive content from sites that generate billions of dollars in revenue from advertisers.
Felix Arvid Ulf Kjellberg, who uses the moniker PewDiePie, said on Twitter that he was "absolutely sickened having my name uttered by this person". "This is a case where you're giving a platform for hate". That year, a video of a man shooting and killing another in Cleveland also shocked viewers.
U.S. President Donald Trump posted a tweet condemning the "horrible massacre", as did former leader Barack Obama.
"We are adding each video we to find to an internal data base which enables us to detect and automatically remove copies of the videos when uploaded again", she said in a statement.