Manifesto of a madman: Christchurch shooter posted 87-page rant online foreshadowing the massacre - telling how he was 'inspired' by Norway killer Anders Breivik and why he decided to switch targets at the last minute Gunman posted a manifesto online hours before opening fire inside a mosque The terrorist described himself as a 28-year-old who was born in Australia He wrote in the document that he took inspiration from mas killer Anders Breivik By Josh Hanrahan and Stephen Gibbs for Daily Mail Australia Published: 04:21 GMT, 15 March 2019 | Updated: 04:34 GMT, 15 March 2019 Viewcomments A terrorist who opened fire on a New Zealand mosque published an online manifesto detailing his plans to carry out a massacre hours before the attack. The 87-page document, which he called 'The Great Replacement', was published by Brenton Tarrant on the morning before he opened fire inside the Al Noor Mostque in Christchurch. At least 27 people are believed to have been killed. It is understood the suspected shooter is an Australian, aged 28. The manifesto reveals in chilling details his grievances, why he picked the mosque and claims he was inspired by Norway mass shooter Anders Behring Breivik. Brenton Tarrant, 28, opened fire on a mosque in Christchurch, New Zealand, on Friday A terrorist who opened fire on a New Zealand mosque published an online manifesto detailing his plans to carry out a massacre hours before the attack 'I have read the writings of Dylan Roof and many others, but only really took true inspiration from Knight Justiciar Breivik,' he wrote. The suspected shooter described himself as an 'ordinary white man born in Australia to a working class, low income family.' 'I am just a regular White man, from a regular family. Who decided to take a stand to ensure a future for my people,' he wrote. Daily Mail Australia understands the man grew up in Grafton, in regional New South Wales. He said he had 'little interest in education' and 'did not attend University as I had no great interest in anything offered in the Universities to study'. The man said he initially planned to target a mosque in Dunedin, but changed to the Al Noor Mosque because it had 'far more invaders'. Explaining his plans the massacre, the shooter wrote that: 'To most of all show the invaders that our lands will never be their lands, our homelands are our own and that, as long as a white man still lives, they will NEVER conquer our lands and they will never replace our people. 'By the definition, then yes. It is a terrorist attack. But I believe it is a partisan action against an occupying force.' The manifesto reveals in chilling details his grievances, why he picked the mosque and reveals why he was inspired by Norway mass shooter Anders Behring Breivik (pictured) He also claimed to be inspired by Candace Owens, an outspoken backer of United States president Donald Trump. 'The person that has influenced me above all was Candace Owens, each time she spoke I was stunned by her insights.' Witnesses reported hearing 50 shots from his weapons including a semi-automatic shotgun and a rifle at Al Noor Mosque in Christchurch on the country's South Island. The gunman live-streamed the mass shooting inside the Al Noor Mosque, which happened about 1.30pm (11.30am AEDT) as Friday prayers were underway. A video seen by Daily Mail Australia shows the man firing multiple shots at dozens of people as they try to flee. A suspect is in custody but it is unclear whether it is the gunman. Share or comment on this article: All rights reserved for this news site dailymail and under his responsibility