A 34-year-old man was hospitalized in serious condition Friday morning after another man hit the victim with a dangerous instrument in Waianae, according to police.
The incident happened just before 3:30 a.m. on Jade Street.
Investigators say there was an argument between the two men before the assault.
The suspect is a 36-year-old man and he has not yet been arrested.
Police have opened a first-degree assault and terroristic threatening case.