A number of improvised explosive devices found on vehicles after the shootings were defused by police.
Players from the Hamilton Chiefs and the Hurricanes, two of New Zealand's professional rugby teams, came together in tribute ahead of their Super Rugby match in Hamilton on Friday evening.
The European Commission said: "This senseless act of brutality on innocent people in their place of worship could not be more opposite to the values and the culture of peace and unity that the European Union shares with New Zealand".
The shootings took place in Christchurch, New Zealand near Cathedral Square and Hagley Park. I had a regular childhood, without any great issues.
In the video live-streamed by Tarrant, a man inside a mosque appears to say "Welcome brother" as a gunman approaches.
British boyband Blue wrote: "Last month we had the honour of playing our first show in New Zealand in over 15 years and can attest to the warm generous nature of New Zealanders".
London Mayor Sadiq Khan said there will be a "highly visible" policing presence around the capital's mosques today as he sought to offer reassurance to those heading to Friday prayers.
The gunman is said to be an Australian citizen, and has been described as an "extremist, right-wing, violent terrorist" by Australian Prime Minister Scott Morrison.
A Twitter account with the handle @brentontarrant posted on Wednesday images of a rifle and other military gear decorated with names and messages connected to white nationalism.
She was earlier cited by media as saying six Indonesians had been inside one mosque when the attack occurred, with three managing to escape and three unaccounted for. "They are us. The person who has perpetuated this violence against us is not".
Media later reported that not one but two mosques had been attacked.
Of the victims, she said: "I will have been amongst other members of the public who will have seen the footage as the injured were being brought to Christchurch A&E and you certainly can see from that footage there is a real range of ages there".
The gunman then walks back into the mosque, where there are at least two dozen people lying on the ground.
Clark on Friday described the Christchurch shootings as "a heinous hate crime".
'My heart goes out to the families of the murdered and all those impacted by this act of terror.
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