Yesterday afternoon, a white nationalist terrorist used multiple weapons to shoot and kill at least 49 people at the Al Noor and Linwood Mosques in Christchurch, New Zealand.

Though police reported taking four people into custody, only one has been charged with murder. Prime Minister Jacinda Ardern described the shootings as a “terrorist attack,” and raised the national security threat level to its second-highest level.

In a rambling, 73-page manifesto, the 28-year-old Australian attacker praised a Norwegian mass murderer and attempted to articulate a militant, white nationalist ideology. He also referenced the Knights Templar, a Christian extremist group the Norwegian shooter hoped to create.

The attacker also streamed the massacre on Facebook — leaving tech companies scrambling to remove it and the posts of those who praised it. After being alerted to the live stream of the attack by New Zealand police, Facebook said they are “removing any praise or support for the crime and the shooter or shooters as soon as we’re aware.”

According to Lucinda Creighton, senior advisor at the Counter Extremism Project, “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.”

In a tweet on Friday morning, President Trump said “my warmest sympathy and best wishes goes out to the people of New Zealand after the horrible massacre in the Mosques. 49 innocent people have so senselessly died, with so many more seriously injured. The U.S. stands by New Zealand for anything we can do. God bless all!”

During a campaign rally in Houston last October, Trump said “you now, they have a word, it sort of became old-fashioned. It’s called a nationalist. And I say, ‘really? We’re not supposed to use that word? You know what I am? I’m a nationalist. OK? I’m a nationalist.”

Just a month earlier, in her first speech to the United Nations General Assembly, Prime Minister Ardern “called for a different world order — one that puts ‘kindness’ ahead of isolationism, rejection, and racism,” in an address described by the Sydney Morning Herald as “a call to arms against the retreat into protectionism and nationalism urged by Trump.”