A sheriff's captain said at least six people were shot late Wednesday when a suspect opened fire in a crowded Southern California bar.
He could not immediately provide information on the extent of the victims' injuries.
He did say that it was still "a very active scene".
Officers at the scene told the newspaper that about 30 shots had been fired. The witness, who escaped unharmed with his stepson, said he saw the gunman shoot multiple people.
A witness told ABC7: 'I was at the front door talking to my stepdad. I look up - the security guard is dead.
Reports say the suspect may have used smoke grenades as well as a gun in the attack.
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The gunman is described as having a beard and wearing a hat and glasses.
Officers escorted large groups of people to safety as they left the area.
They said that soon after the gunman opened fire, victims were running to a nearby petrol station to get help.
Witnesses told The LA Times someone ran into the bar about 11.30pm, United States time, and started firing what appeared to be a black pistol.
A college country night was being held at the venue, which is popular for line dancing.
"With over 2,500 square feet of wide open dance floor, Borderline has provided a haven for country line dancing folks of all ages equiped with pool tables", the website said.