A police officer was knocked unconscious after attending reports of an unruly man at a block of Whangārei shops.
The incident happened at the Otaika Shops on Otaika Rd around 4pm on Tuesday.
A witness said she had initially contacted police because a man was making a nuisance of himself outside the shops.
Police said two officers responded at around 3.50pm and began speaking with the man.
A some point "without warning" he allegedly assaulted one of the officers, resulting in a facial injury, before running off.