Honolulu police arrested a 21-year-old man early today in connection with a double-homicide of a 23-year-old woman and six-month-old boy in Ewa Beach.

The double-homicide occurred at a unit at 91-214 Hanapouli Circle at the Sun Rise townhome complex near the Ewa Town Center. Police said the suspect is the woman’s boyfriend.

Lt. Deena Thoemmes of the Honolulu Police Department’s Homicide Detail said patrol officers responded to a call of suspicious circumstances at a residence at about 11:50 p.m Wednesday.

Upon arrival, a witness met with officers who informed them that she visited the residence to check on her friend when she found both her friend and an infant dead in the residence.

A preliminary investigation indicated the woman sustained a stab wound or wounds. The type of injuries the baby boy sustained is still under investigation.

Police issued an all-points bulletin on a possible suspect’s vehicle. At the same time, officers from the Wahiawa Police Station were responding to a two-vehicle collision on Kunia Road in proximity to Lyman Road.

Two drivers involved in the crash sustained injuries and were taken to a hospital.

Thoemmes said one of the drivers was positively identified as the suspect in the double-homicide. Police arrested him at about 3:25 a.m. today on suspicion of first-degree murder.

Detectives are still at the scene investigating the double-homicide.

Police around 8:42 a.m. reopened the southbound lanes on Kunia Road from Lyman Gate at Schofield Barracks, and the northbound lanes on Kunia Road from Anonui Street after they had been closed for eight hours because of the police investigation.