Threats against a woman who made "unfortunate" comments about a soldier killed in Afghanistan can't be condoned, Prime Minister John Key says.
Barbara Sumner-Burstyn, a Canadian now living in New Zealand, last week accused Lance Corporal Jacinda Baker of "killing innocent people".
She said on her Facebook page: "Oh, so fallen soldier Jacinda Baker liked boxing and baking - did they forget she also liked invading countries we are not at war with, killing innocent people and had no moral compass."
Former soldier Ted Grainger reacted by creating a Facebook page titled "Sumner Burstyn give back your NZ passport".
It gained more than 21,000 followers and Ms Sumner-Burstyn says some responses were extreme and included threats to rape or kill her.
Mr Key told reporters he thought Ms Sumner-Burstyn's comments were "unfortunate... this is a fine New Zealand soldier who has passed away and I think we should be careful in making those kind of comments".
Mr Grainger has shut down his Facebook page.
"Obviously we don't condone some of the reactions but I think it's a highly-charged debate and it's important for everyone to be thoughtful," Mr Key said.
Ms Sumner-Burstyn has apologised for her comments, saying she had a difficult few days.
She says her family has had to flee their home after her contact details were published.