Members of the public on Morrinsville's main street were left flabbergasted after a Waikato constable was bashed up to 15 times over the head.
Morrinsville police Acting Sergeant Will Hamilton said the officer was sent into the town's CBD after reports of a man walking down the street with a hammer down his pants.
"An officer was sent to the job and confronted the male and then at some stage the situation has very quickly escalated and the constable has been subjected to a reasonably vicious and serious alleged assault, taking 10 to 15 blows to the head by the man's fists."
Hamilton said it's not clear if the hammer was at some stage removed from the man's pants or remained concealed.
However, the constable managed to get some distance between himself and the alleged attacker, and tasered him as more police officers arrived at the scene.