New Zealand Police Minister Judith Collins has slammed a "stunt" in which a newspaper sent people masquerading as terrorists with fake bombs to Super 14 rugby games as "unbelievably stupid".

The Sunday Star-Times commissioned people dressed as terrorists to enter stadiums in the southern city of Christchurch and the northern city of Hamilton last weekend, Collins said.

"The actions are unbelievably stupid and irresponsible. This stunt had the potential to result in games being called off and stadiums evacuated," Collins said.

"Common sense would tell you that running around a stadium dressed as a bomber has the potential to end very badly," she said.

Any panic could have resulted in injuries, particularly to the elderly and children, she said.

Reports said the bogus terrorists with fake bombs strapped to their bodies entered public areas, the players' tunnel and corporate hospitality areas in the stadiums.

The Sunday Star-Times declined to comment immediately on the incidents.

Police were aware of what happened but it was unlikely criminal action would be taken, spokesman Jon Neilson said.

"We are aware of the situation and have been looking into it. But at this stage, it would not appear that there has been any offence committed," he said.

The Waikato Chiefs played Australia's Queensland Reds last Friday in Hamilton and the Canterbury Crusaders played the Auckland Blues as part of the Super 14 series, which features teams from New Zealand, Australia and South Africa.

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