NAMPA -- A confrontation that began inside a downtown Nampa bar erupted into a shootout Tuesday night.

Nampa Police Lt. Eric Skoglund said Wednesday that investigators are still searching for the people involved in the gun battle.

Police were called just before midnight. The skirmish initially started at the Whiskey River Bar and moved down the street, outside the 1918 Lounge.

By the time officers arrived, Skoglund said, all the participants in the shooting had already scattered.

A witness who heard multiple bangs told KTVB it sounded like fireworks going off. That's when they came outside and saw shell casings from the bullets covering the street.

Officers found evidence that multiple people had fired multiple rounds. The shootout appeared to be between people wearing the insignia of the Devils Disciples motorcycle gang and another group.

"These types of incidents don't happen often downtown, so this is something we're obviously taking very seriously, and we're going to be working very diligently to identify the people that were involved," said Skoglund.

Skoglund said no one was hurt in the shooting, but bullets struck three cars and a building.

The people involved in the shooting have not yet been identified, and a motive in the fight is unknown.

Anyone with information is asked to contact Detective Chris Davenport at 208-468-5623 or Crime Stoppers 343-COPS (343-2677).