Police arrested a 24-year-old man after he allegedly struck a 28-year-old man with a metal pipe in Wahiawa.

Just after 3:05 a.m. Thursday, police said a man approached another man and asked for a cigarette. At some point, the encounter escalated into an argument.

Police said the suspect left the area and confronted the victim on Ohai Place with a metal pipe. He then struck the victim, 28, in the head with the pipe, causing minor injuries.

Police said the victim returned home. When his 28-year-old girlfriend learned of the attack, police said she allegedly grabbed her boyfriend’s firearm and went to confront the suspect.

The 24-year-old man saw the firearm and assaulted her. Police said she then fled.

Police were called and the 24-year-old man was arrested on suspicion of second-degree assault.

Police also arrested the woman on suspicion of first-degree terroristic threatening and place to keep a firearm.