Footage from an anti-Semitic attack in the German city of Halle was livestreamed overnight on Amazon's video gaming platform Twitch.
Ms Ardern said the second element, which involves technological development and research which is needed to stop livestreaming happening in the first place, is still a work in progress.
"We labored with urgency to desire this deliver material and can completely suspend any accounts stumbled on to be posting or reposting deliver material of this abhorrent act", the company stated.
Facebook said it had to remove over 1.5 million videos of the attack that were posted within 24 hours of it happening.
Two people also suffered serious bullet wounds in the attack and were being operated on, a spokesman for the city's hospital said.
Max Privorotzki, the head of Halle's Jewish community, said there was security outside the synagogue when the shooting happened, but Josef Schuster, the head of Germany's Jewish community, said there were no police guards outside - which he called "scandalous". The attack occurred around noon local time, and the suspect was arrested by police at around 3:30 p.m.
According to Der Spiegel he is a 27-year-old man from the state of Saxony-Anhalt.
InternetNZ chief executive Jordan Carter on Thursday said the Halle video didn't seem to have spread as far or as fast as the March 15 one.
German authorities stated that they had one suspect in custody and were investigating a video. They didn't specify why the "acute" danger is now deemed to have passed.
Without mentioning the far-right Alternative for Germany (AfD) by name, Merkel and Steinmeier condemned xenophobic rhetoric they said had grown increasingly mainstream and risky.
Spokesman Hana Rubasova says officers are focusing on synagogues and other Jewish buildings and objects, Prague's global airport and the border.
"In the name of the Israeli people I send condolences to the families of the victims and wishes for a speedy recovery to the injured", he went on.
Unlike synagogues in many other German cities, the one in Halle didn't have police officers outside for Yom Kippur, an omission strongly criticized by Jewish leaders.
"They have taken over the investigations". German news agency dpa reported that the federal prosecutor's office said it had assumed responsibility for the shooting case.
The place changed into placed on lockdown after the assault, with police initially reporting that a pair of attackers had fled the scene.
Halle Police urged the public not to share photos and videos of the attack circulating online.
The clip shown by regional public broadcaster MDR shows the man getting out of a auto and firing four shots from behind the vehicle from a long-barreled gun. It wasn't clear what he was shooting at.
Police enter a Jewish cemetery over a wall near the scene of the shooting.
A tweet from police advised local people to remain vigilant. He then shot several rounds at a woman passerby.
Pletoukhina, whose husband helped barricade the front door, said it was "a scandal" the shul had not been placed under police protection on Yom Kippur, echoing calls in the community for greater security to prevent future attacks.
Rifat Tekin, who worked at the Halle kebab outlet, said he was making a kebab for two construction workers when a perpetrator threw an explosive at the restaurant before shooting. She said there was no further details on the suspects or what type of auto was involved.