New Zealand banned semi-automatic and automatic weapons just days after a man used similar firearms to kill 51 people in two Christchurch mosques in March, and the country’s prime minister does “not understand” why the United States hasn’t passed similar gun control laws in the wake of repeated mass shootings on its own soil.

CNN’s Christiane Amanpour asked prime minister Jacinda Ardern what the rest of the world can learn from New Zealand ahead of a summit on online extremism held in Paris on Wednesday, two months to the day of the Christchurch massacre, which was livestreamed on platforms such as Facebook FB, +0.20% , Twitter TWTR, -4.83% and YouTube GOOG, +0.92% . And Ardern said that while guns have a “practical purpose ... that does not mean you need access to military-style semiautomatic weapons and assault rifles. You do not. And New Zealanders by and large absolutely agreed with that position.”

“ ‘Australia experienced a massacre and changed their laws. New Zealand had its experience and changed its laws. To be honest, I do not understand the United States.’ ” — Jacinda Ardern

Recent shootings at the STEM School Highlands Ranch in a Denver suburb (which killed an 18-year-old student and wounded eight more) and at UNC Charlotte (which killed two and wounded four) have kept the gun control debate in the news. Indeed, the U.S. has had 122 mass shootings already in 2019, according to the Gun Violence Archive, which defines mass shootings as four or more people besides the shooter being killed or hurt.

Related: New Zealand bans assault weapons, just days after mosque massacre

Sen. Kamala Harris pledged last Sunday that she will take executive action on gun-control measures if she’s elected president in 2020. Fellow candidate Sen. Cory Booker has proposed a federal gun control registry. The Trump administrator has enforced a ban on bump stock devices, which allow semi-automatic weapons to fire like machine guns, but gun control advocates say there is more that needs to be done.

Related: The New Zealand prime minister will never say the Christchurch gunman’s name again

Ardern also discussed the need to end the use of social media for terrorist acts, such as the 17-minute livestream of the Christchurch massacre, which is what she will be discussing with French president Emmanuel Macron in Paris this week. They will be pushing a “Christchurch Call” initiative to ask governments and internet companies like Facebook and Google to remove terrorist broadcasts quickly when they do appear, and to do more to prevent terrorist acts from being livestreamed in the first place.

Related: Facebook restricts live streaming in response to criticism over terrorist content

“When it came to the way this attack was specifically designed to be broadcast and to go viral, (responding) to that needed a global solution, so that was why we immediately got in contact with international counterparts,” Ardern said.