KANSAS CITY — An armed security guard saved several lives when he shot and killed a heavily armed man who opened fire on a line of people waiting to get into a Kansas City, Missouri, bar, killing one person and wounding at least 15 others, Kansas City's police chief said Monday.

Police were still trying to determine a motive for the late Sunday shooting at the 9ine Ultra Lounge in eastern Kansas City that created a chaotic scene as hundreds of patrons fled the scene on foot and in cars, police Chief Richard Smith said.

"We know that there were multiple firearms involved, so we think the security guard's actions definitely saved lives," said Smith.

The security guard, whose identity was not released, fatally shot Jahron Swift, 29, of Kansas City, police said. The woman who died was identified as Raeven Parks, 25, of Kansas City. It was not known if there was any connection between Swift and Parks, Smith said.

Smith said police had received complaints in the past about the club and officers had driven through the parking lot shortly before the shooting and saw nothing suspicious. A disturbance occurred in the line shortly before the shooting but it wasn't clear if the suspect was involved in that confrontation, he said.

The security guard, who is licensed to be a guard but is not an off-duty officer, heard the disturbance from inside the bar and went outside and confronted the shooter, Smith said. Police officers didn't fire any shots at the scene.

Police said three of the 15 people who were injured suffered critical injuries but Smith added that those numbers could change as more witnesses are interviewed. He could not say if all the injuries were gunshot wounds.

Smith said the shooting happened despite having extra officers and increased security across the region because of the AFC championship game, which attracted visitors from across the country.