Prime Minister Jacinda Ardern visited a Fijian mosque today to pay tribute to three Fijian muslims who died in the March 15 attack, promising she was doing all she could to stop another attack ever happening again.

Ardern dedicated a plaque to the three Fijian men who died in the Christchurch terror attack, where 51 muslims were killed in two mosques.

Those three were Imam Hafiz Musa Patel, Ashraf Ali Razak, and Ashraf Ali.

Henry Cooke Jacinda Ardern meets with families of the three Fijians who were killed in the attack.

Patel was the head imam of the Lautoka Jame Masjid Mosque, not far from Nadi, for three decades, and was about to retire in the weeks ahead of the attack. He had visited Christchurch on his way to his family in Brisbane.

Ardern spoke briefly with the families of the men who died, including the wife of Patel, who she had briefly met in the hours after the attack.

Henry Cooke Jacinda Ardern visits the Lautoka Jame Majid Mosque in Fiji to commemorate three people who died in the March 15 attack

"I still remember talking with you Mrs. Patel as you desperately looked for your husband. I remember you retracing his steps and feeling pained to leave you with the Red Cross. In your darkest of hours I can tell you I will never forget your grief," Ardern said.

Ardern told media Patel was looking to find a woman who helped by driving her around Christchurch looking for her husband - a Heather from Papanui.

"She just told me she asked Heather to drive her around until she found a crowd. That is where I found Mrs. Patel. To Heather from Papanui - thank you for embodying the New Zealand spirit of kindness and generosity in the moments after the attack."

Ardern told the family of Razak that they now had a home in New Zealand.

"Please know that New Zealand now carries him in your hearts and that you have a home in New Zealand now too."

Mohammed Iftikar Ali, the grandson of Razak, travelled from Suva for the unveiling of the plaque - which mispelt his grandfather's name.

He talked to Ardern about his grandfather, who he said was the pillar of his community.

"He made me what I am today," Ali said.

"He was like if superman was a normal guy."

Ali said Ardern's visit comforted him.

"She's here to help up and we really appreciate it...It's really comforting for us that she's here. We really appreciate it."

Ardern said unveilling the plaque was a somber moment.

"That's the kind of thing you hope you never have to unveil - a memorial in another country to loss that was experienced in New Zealand."

She said in a speech that New Zealand was doing all it could to counter violent extremism - but could not do it alone.

"Today I want to talk about our commitment to working to ensure these attacks never happen again. Our commitment to eradicate the underlying drivers and ideologies of such cowardly attacks. Our commitment to promoting the values that Fiji and New Zealand share – those of inclusion and diversity, of kindness and compassion."

"The Christchurch attack exposed weaknesses in our gun legislation. A week after the attack, we announced a ban on all military style semi-automatics – like the one used in the attack – removing them from our communities."

Ardern said New Zealand still had work to do to make New Zealand more inclusive.

"That means thinking about how we can build a welcoming and inclusive society in which diversity doesn't just exist but is valued. A society in which we break down the walls of "otherness" and instil in everyone a pride in being a New Zealander and what that means."

"Despite our celebration of diversity, we still have work to do to strengthen New Zealand society. We are not perfect."

"In the face of hate and violence, the Muslim community in New Zealand – and around the world – had every right to express anger. Instead they chose love. Instead they chose to open their hearts for all of us to grieve with them."

Ardern is travelling on to Sydney this evening before heading back to New Zealand on Friday.