The 59-year-old Canadian songwriter was due to appear at Hagley Park in the New Zealand city on Sunday, but has since put the concert on hold following the tragic attack.
Two other people remain in custody.
Armed police were deployed after shots were fired at a mosque around 1:40 p.m. local time. "So we must face that hate and terror with love and compassion and not only should Muslims be going to jumah today, everyone should join them in solidarity".
The National Council of Canadian Muslims says in a statement that after the attacks in Christchurch and the Quebec City mosque shooting that killed six people during prayers in 2017, Muslims feel vulnerable and unsafe and that it is "essential" that political leaders call the attacks for what they are: Islamophobic terrorism. Worshippers, possibly dead or wounded, lay on the floor, the video showed.
After going back outside and shooting a woman there, he gets back in his auto, where the song "Fire" by the English rock band The Crazy World of Arthur Brown can be heard blasting.
He visited Bulgaria from November 9-15 past year claiming he wanted "to visit historical sites and study the history of the Balkan country", Bulgaria's public prosecutor Sotir Tsatsarov said, adding that the inquiry would establish if this was "correct or if he had other objectives".
The footage showed the killer was carrying a shotgun and two fully automatic military assault rifles, with an extra magazine taped to one of the weapons so that he could reload quickly.
In a rambling manifesto published online to justify the murderous attacks that followed, he introduced himself as "just a regular white man" of "Scottish, Irish and English stock".
A licence must be obtained, however New Zealand is one of the few countries where most individual weapons don't have to be registered.
He said he was a 28-year-old white Australian and a racist.
Ardern went on to say that, "These are people who I would describe as having extremist views that have absolutely no place in New Zealand and in fact have no place in the world".
From what we know, it does appear to have been well planned. At the time this article was published, more than 7,000 people from around the world contributed.
Christchurch was the home of these victims.
Ibrahim said he managed to escape via the backdoor of the mosque: "Lots of people we were inside and there was a door on the right side for the ladies entrance section".