FREMONT -- A weekend quarrel involving a Fremont woman's ex-husband and her new boyfriend left one man stabbed, another man with a shovel-induced headache, a vehicle vandalized and no one arrested, police said.

Officers were called at 11:30 p.m. on Saturday to a house on Essanay Avenue after a 911 caller told a dispatcher they heard banging noises and people screaming in the home, said police spokeswoman Geneva Bosques.

When officers arrived, they found a man outside suffering from a blow to the head. Police later learned he'd been hit in the head with a shovel by his ex-wife's boyfriend during a fight, Bosques said.

Officers located the boyfriend inside a home next door, Bosques said. A short while later, he exited the home and was detained.

The ex-husband was taken to a local trauma center to be treated for a minor head injury.

Bosques said the fight stemmed from an unresolved incident surrounding the ex-husband and his ex-wife's new boyfriend. The ex-husband vandalized the vehicle of the new boyfriend and a fight broke out. The ex-husband then stabbed the new boyfriend, so the boyfriend picked up a shovel and hit the ex-husband on the head, Bosques said.

The boyfriend suffered a minor cut and did not request medical attention, Bosques said.

Officers determined the fight was "mutual combat" and that both men were victims so they were released from custody.

The case was sent to the Alameda County District Attorney for review.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.