Police are reminding Kiwis to keep outdoor activities low risk at alert level 3 after fishermen had to be airlifted to safety today by emergency workers.

"There have been two separate incidents today, one in Waimakariri and one in Peraki, where people fishing have required rescue by helicopter," said Senior Sergeant Paul Robertson.

"The incidents resulted in an emergency response from police, the helicopter service and Fire and Emergency New Zealand."

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As a result of the Waimakariri incident, a man has been charged with breaching the Health Notice and has been summoned to appear in the Christchurch District Court.

Robertson said this was a reminder that New Zealand was on alert level 3, restrictions are still in place and any outdoor activity should be low risk and local.

"Our message remains the same -when it comes to outdoor recreational activities we need people to stay local and apply common sense," Robertson said.

"As these two instances clearly demonstrate, if you don't do that you could risk injury or require search and rescue services.