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"I no longer have enough in the tank" - an emotional Jacinda Ardern says she will quit next month as New Zealand PM.
The 42-year-old said almost six "challenging" years in the job had taken a toll.
She will step down as Labour Party leader no later than 7 February. There will be a vote in the coming days to determine her replacement.
New Zealand will hold a general election on 14 October.
Ms Ardern said she had taken time to consider her future over the summer break.
"I had hoped that I would find what I needed to carry on over that period but, unfortunately, I haven't, and I would be doing a disservice to New Zealand to continue."
Ms Ardern became the youngest female head of government in the world when she was elected prime minister in 2017, aged 37.
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