Three people were killed and nine others were injured Tuesday night when gunfire erupted at a Halloween party at a home in Long Beach.

According to LA Times, police and fire officials were called to a duplex behind a nail salon on 7th Street near Temple Avenue around 10:44 p.m. and came across what authorities described as a mass casualty incident.

When officers arrived at the home, they found victims inside and outside the residence. Some of the partygoers were dressed in costume for Halloween, said Long Beach police spokeswoman Jennifer De Prez.

Here’s more from Long Beach Public Information Officer Jake Heflin via LA Times:

Three men were killed in the shooting. Two men and seven women were hurt, and their conditions were not immediately available. Those who were injured range in age from 20 to 49.

Authorities said that they are still searching for at least one male suspect who fled from the scene after the shooting and that they did not have evidence that the shooting was a gang-involved incident.

A description of the suspect isn’t available at this time.