Three people are in New Zealand Police custody following the Thursday masacre, which was live-streamed on Facebook by the shooter.
The main suspect, who videoed the killing of 49 people at two Mosques, made his first appearance in court Saturday.
Suspect Brenton Tarrant, 28, was in Christchurch District Court on charges of murder.
Tarrant did not enter a plea and was ordered to be held without bail.
New Zealand Prime Minister Jacinda Rdernhas now vows action against guns, following the worst mass shooting in the country’s history.
“I can tell you one thing right now, our gun laws will change,” Rdernhas said.
President Donald Trump and other US officials have been in communication with their counterparts in New Zealand and President Trump offered condolences to them, along with any assistance the US can provide them during this time.