An 18-year-old man parked in a Hawaii Kai park with his ex-girlfriend was attacked yesterday by six or seven males, including the woman’s current boyfriend, Honolulu police said.

The attackers drove up in two vehicles around 2:20 p.m. and the woman’s current boyfriend got out and punched the ex-boyfriend in the face, police said.

As the two began to fight, the other males jumped in and overpowered the 18-year-old, police said. One of them allegedly hit the victim with a hammer, police said.

The men — and the woman — then fled in their vehicles.

The 18-year-old was taken by an ambulance to a hospital and treated and released for minor injuries.

Three male suspects — ages 21, 18 and 17 — were later arrested in Kaimuki when their vehicle was spotted. Because the 18-year-old discovered that his cell phone had been taken, the suspects were arrested on suspicion of robbery in the first degree, police said.

The other suspects, including the one who allegedly used the hammer, are still being sought by police.