The Internet accounts linked to the terrorist attacks were published on two mosques in New Zealand and killed 49 people over the past days on social networking sites and forums.
The attacker did not hide his racist motives, which he recorded on his weapon, as well as his use of music in the background of the video, which he broadcast on Facebook showing his aggressive aggression.
The PRINTONTARNET account on Twitter posted pictures of a gun later used in the Christchurch attack.
The picture of the gun was covered with white letters to the names of other people who had committed ethnic or religious killings, Slavic, Armenian and Georgian references to historical figures and events and a derision of a UN booklet on how to deal with migrants.
On the side of the gun he also wrote a number 14 in reference to a slogan used by white racists consisting of 14 words.
Other tweets posted by the same user on the day included references to the declining fertility rate of whites, articles on right-wing extremists in different countries and stories of alleged crimes by illegal immigrants.
The account, which was set up last month, published 63 tweets and was followed up by 318 observers.
He also wrote the history of 1571, in a clear reference to the naval battle of Lepanto, also lost by the Ottoman Empire, as he wrote on his weapon: "Refugees, welcome to hell?"
During the mass murder of Tarrant, he used music in the background of his video on Facebook, a song in Serbian referring to Radovan Karadzic, known as the "Incest of Bosnia," who committed genocide against Muslims during the 1992- 1995).
Before the attack on the mosque, footage taken by the attacker showed machineguns and ammunition in the front seat of the car next to him, as well as petrol cans.
The gunman recorded his attack on the mosque through a camera mounted in the middle of a helmet he was wearing. The shooting began from the moment he arrived at the mosque.
The New Zealand Herald details the seventeen minutes during which the gunman attacked the Al-Nour mosque on Deniz Street in Christchurch during Friday prayers.
The newspaper reported that the gunman, entered the mosque carrying a machine gun, and took shots from the outside gate until entering the mosque, without any resistance.
After three consecutive minutes of shooting at the worshipers inside the mosque, the gunman went out to retrieve his machinegun with the ammunition in his car outside the mosque, before returning to the mosque again and continuing to shoot.