When is the New Zealand prime minister election and how will it work?

FILE PHOTO: Prime Minister Jacinda Ardern addresses supporters at a Labour Party event in Wellington, New Zealand, October 11, 2020. REUTERS/Praveen Menon/File Photo

SYDNEY (Reuters) - New Zealand Prime Minister Jacinda Ardern will step down no later than Feb. 7 after a shock resignation on Thursday in which she said she "had no more in the tank".

Leadership hopefuls will gather on Sunday when the centre-left Labour party caucus meets to elect a new leader, who will become prime minister. Here's what will happen: