Australian man Brenton Tarrant, 28, published ‘The Great Replacement’ the morning before opening fire at two mosques in Christchurch, on New Zealand’s south island.

Tarrant live streamed his attack on the Al Noor mosque on Facebook.

At least 40 people are believed to have been killed in the attack, with more than 20 also in hospital in severe conditions.

Police have so far arrested three men – including Tarrant – and a woman, according to Daily mail.

The chilling manifesto reveals his grievances, why he picked the mosques in Christchurch and how he was inspired by Norway mass killer Anders Behring Breivik, who killed 77 in 2011.

‘I have read the writings of Dylan Roof and many others, but only really took true inspiration from Knight Justiciar Breivik,’ he wrote.

Tarrant’s reference to Breivik as a ‘Knight’ relates to the Norwegian’s support for the Knights Templar – an extremist Christian group of specialist fighters from the 12th century.

Tarrant also claimed he had been inspired to carry out the attacks as ‘revenge for the enslavement of millions of Europeans taken from their lands by the Islamic slavers’ and ‘to directly reduce immigration rates to European lands by intimidating and physically removing the invaders themselves’.

Tarrant 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 Tarrant grew up in Grafton, in northern New South Wales, where much of his family still lives.

In the manifesto Tarrant said that he especially hated Muslim converts that turn their backs on their ‘heritage’, ‘cultures’, ‘traditions’ and ‘became blood traitors to their own race’.

He also said that 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 and Masjid Mosques because they had ‘far more invaders’.