A New Zealand politician could be forced to apologise over an "extremist" magazine column calling for young Muslims to be banned from flying on Western airlines, after he had his Swiss army knife confiscated at Christchurch Airport.

In a column in Investigate magazine, New Zealand First MP Richard Prosser refers to "a sorry pack of misogynist troglodytes from 'Wogistan'" threatening the Western way of life and travel security "in the name of stone-age religion".

He acknowledged not all Muslims were terrorists, but said most terrorists were Muslims who wanted to attack the Western world.

"If you are a young male, aged between say about 19 and about 35, and you're a Muslim, or you look like a Muslim, or you come from a Muslim country, then you are not welcome to travel on any of the West's airlines," he wrote.

"If the greatest identifiable threat to modern aviation security is posed by young Muslim males, then surely the answer is to prohibit young Muslim males from flying on our aeroplanes."

New Zealand First leader Winston Peters said Mr Prosser was out of line with the column.

"It's an extremist view on a very extremist issue, but you can't lump everyone in the same boat," he said.

"Where's the side that says `I'm not talking about this group of people, the mass majority of Islamic people who are law-abiding and peaceful'?" Mr Peters said.

However, he added: "There's an element of truth to what he's saying ... There are far too many Muslim extremists."

The column was written "as a journalist" and Mr Prosser did not speak for the party.

Mr Peters would not say whether Mr Prosser would be made to apologise.

Prime Minister John Key said Mr Prosser's column was "appalling".

"It's an example of the depth of the thinking coming out of the New Zealand First caucus.

"It's stupid and it was premeditated because he wrote it in an opinion piece. It's clearly what New Zealand First think of other New Zealanders."

 

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