Updated

A gunman shot four people to death inside a Korean health spa in Atlanta's suburbs and then killed himself in what police said may have been a case of domestic violence.

Surveillance video showed a man walking into the Su Jung Health Sauna on Tuesday night and getting into an argument with someone, then opening fire, police said.

"It appears he walked in, had some conversation with one of the victims and the shooting started," Norcross Police Chief Warren Summers told WAGA-TV.

Investigators finished interviewing witnesses Wednesday morning, Norcross police Capt. Brian Harr said. He said the shootings were not random.

"It's probably domestic-related," Harr told The Associated Press, adding that more information would likely be released later Wednesday.

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Yellow police tape surrounded the large parking lot in front of the stand-alone brick building with decorative white columns and white Greek-style statuary. The spa is located on a busy highway lined with strip malls and small businesses, many with signs in Korean and English. It was closed Wednesday.

Police said the dead were three men and two women. Four people were found dead inside, and another was taken to a hospital before being pronounced dead, investigators said.

Investigators say they believe about 20 people were inside the spa when the gunfire began around 8:30 p.m.

Sonny Lee, who owns Lee's Auto Center next door to the spa, said the owner had been in the community for about 15 years and had recently remodeled his business. Lee said the spa owner was very community-oriented.

"He donated a lot to the different things in the Korean community," Lee said.

Police have not identified the victims yet.

The Georgia Bureau of Investigation joined the probe, GBI spokesman John Bankhead said.

"We actually sent two crime scene specialists, given the situation out there with the number of people who were shot and killed," Bankhead said.

He said investigators were using 3-D technology that was designed for architecture and construction jobs and is now being used in some investigations to recreate crime scenes.

The spa is about 15 miles northeast of downtown Atlanta, on Buford Highway between Peachtree Industrial Boulevard and Interstate 85 in Gwinnett County.

Click here for more on this story from MyFoxAtlanta.com.

Police: 5 Shot Dead at Norcross Health Spa: MyFoxATLANTA.com

Newscore contributed to this report.