Coronavirus: Auckland's City Kickboxing Gym served warning for breaching COVID-19 alert level lockdown rules

Auckland's renowned City Kickboxing Gym has warned by police for breaching alert level four COVID-19 lockdown rules.

The mixed martial arts gym houses several prominent fighters, including UFC middleweight champion Israel Adesanya and heavyweight boxer Junior Fa.

One of the gym's leaders, UFC lightweight Dan Hooker, had taken up residence at the gym, since the country was plunged into lockdown.

Hooker and some of his teammates have scheduled fights for September/October, both in New Zealand and across the globe, and that group and their training partners had created a single bubble inside the gym.

CKB's Mike Angove says they believed they were operating within New Zealand's COVID-19 alert level rules, but they were visited by police on Thursday.

"We had done this in the previous lockdown and had received a visit from the police to check the situation, which they approved and allowed to operate," Angove tells Newshub.

"In addition, that lockdown camp had several national and international news stories written about it.

"Since lockdown began, we've done at least four media interviews where we have mentioned we were in a lockdown camp in the gym - in other words, it was no secret and we were of the understanding we were in compliance with COVID regulations.

"On Thursday evening, we received a visit from police, who advised us that due to a change in interpretation, our lockdown camp no longer complied with lockdown regulations. 

"As a consequence, we have disbanded the camp last night to ensure we remain compliant."

Hooker will fight on September 26 in Las Vegas at UFC 266.

The No.8 lightweight in the world is matched against Nasrat Haqparast, as 'The Hangman' looks to break a two-fight losing streak.

Newshub understands Hooker and his coaches are taking 24 hours to assess if the fight will proceed, given he will be unable to train for at least the next week - possibly longer.