The AM Show host Duncan Garner is calling on New Zealand's gangs to give up their guns.
Fifty people were killed when a gunman opened fire in the Deans Ave and Linwood Ave mosques in Christchurch on Friday, March 15.
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The Mongrel Mob has condemned the attack, and members stood guard outside mosques in Hamilton on Friday, one week on.
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Garner said he thinks the Mongrel Mob has been "opportunistic" in its response to the shooting.
"I think it's very opportunistic in the Mongrel Mob, quite frankly what they're doing. I have mixed feelings on this.
"The gangs have a lot of these guns, will they hand them over? This is the challenge to the gangs from me today.
"Will you hand over your semi-automatic weapons? Will you say 'yep, fair enough, here's the amnesty'? Go on, I challenge all the gangs in New Zealand to do it."
Sports presenter Mark Richardson agreed, calling the gang a criminal organisation full of bullies with a good PR department.
"I think they've jumped an opportunity to put that PR department at the forefront."
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Prime Minister Jacinda Ardern announced huge changes to New Zealand's gun laws on Thursday, including a ban on the sale of military-style semi-automatic weapons and a gun buy-back scheme.
Ardern says the new changes should be passed into law by April 11, but in the meantime an E-category licence is now required to buy a semi-automatic weapon, meaning they are much harder to access.
Newshub.
A Newshub special will air on Three and Newshub.co.nz from 1pm to 2:30pm to mark one week since the attack.
