Auckland (CNN) New Zealand Prime Minister Jacinda Ardern will return to the city of Christchurch on Wednesday for the second time since last week's deadly terror attacks at two mosques.

New Zealand is moving swiftly under Ardern's leadership to respond to what she called the "worst act of terrorism" in the Pacific island nation's history.

Ardern said on Monday that the attacks -- which killed 50 people and wounded dozens more -- exposed weaknesses in gun laws that the government will address through reforms to be announced within 10 days.

"There have rightly been questions about how this could have happened here," Ardern said Tuesday during her first address to Parliament since the attack.

"There is anger that it has happened here. There are questions that need to be answered and I assure you they will be."

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