Prime Minister Jacinda Ardern has announced a two-minute silence will be observed on Friday to mark a week since the Christchurch mosque shootings.

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Ms Ardern spoke at a press conference in Christchurch this afternoon when she made the announcement.

"I know from many there is a desire to show support to the Muslim community as they return to mosques, particularly on Friday.

"There is also a desire amongst New Zealanders to mark the week that has passed since the terrorist attack.

"To acknowledge this, there will be a two-minute silence on Friday. We will also broadcast nationally via TVNZ and RadioNZ the Call to Prayer."

Ms Ardern says timing on the two-minute silence and Call to Prayer broadcast will be determined soon.

Earlier today, the Prime Minister thanked first responders for their actions in the aftermath of the attacks that left 50 dead.

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"To everyone that was part of that response, on behalf of everyone in New Zealand, thank you.

"I was amongst those who watched from a distance, probably like many New Zealanders, feeling absolutely aghast at what we were seeing, but also just seeing your work in real time," she said while looking at St John workers in attendance.

"I was in Taranaki, at the police station for the first few moments, then I went to pick up my things and turned on the television and saw you working with speed and with care and I have no doubt that you saved lives."