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“I can assure people there is no point in applying for such a permit,” she said.

The suspect in the shootings, Brenton H. Tarrant, 28, was a licensed gun owner and member of a local gun club. An official with one gun retailer said his company had sold Mr. Tarrant four firearms along with ammunition between December 2017 — a month after Mr. Tarrant received his gun license — and March 2018.

But officials still do not know the source of a semiautomatic rifle that can be seen in a video of the attack on Al Noor Mosque, one of the two mosques the gunman targeted. The authorities say that five guns acquired legally, including two semiautomatic assault weapons, were used in the assault.

On Wednesday, the authorities said that when the suspect was arrested, he had two weapons with him along with explosives and that he was planning to continue his attack.

His efforts were optimized for internet fame and to broadcast a message of white supremacy. Minutes before the attacks started, he published a manifesto to message boards where white supremacists gather, and included a link to the page where the streaming video of the shooting would appear.

In addition to gun policy, Ms. Ardern has been arguing nearly every day since the attacks that there is a need for the world’s most powerful tech platforms to take responsibility for spreading messages of hate that lead to violence.

Leaders in many countries, she said, need to be united in making clear that with profit comes responsibility.

“There are some things we need to confront collectively as leaders internationally,” she said at a news conference in Christchurch on Wednesday. “We cannot, for instance, allow some of the challenges we face with social media to be dealt with on a case-by-case basis.”