https://www.mercurynews.com/2019/03/15/brenton-tarrant-who-is-the-new-zealand-shooting-suspect/

Online accounts linked to the gun attacks that killed 49 people  at two New Zealand mosques on Friday had in recent days circulated white supremacist imagery and extreme right-wing messages celebrating violence against Muslims and minorities.

A gunman broadcast live footage on Facebook of the attack on one of the mosques. Police later said four people were in custody and one had been charged with murder over the country’s worst ever mass shooting.