The officers were then called to a separate spa across the street where another woman was found fatally shot, Bryant said. All four women killed in Atlanta were Asian.
South Korea on Wednesday said its consulate-general in Atlanta confirmed that the dead included four women of Korean descent but was verifying their nationalities.
Long was spotted driving later in southern Georgia, far from the crime scenes, and was arrested without incident after a highway pursuit, authorities said.
His first court appearance was set for Thursday, then postponed without explanation.
Long's quick apprehension was aided by his family's co-operation with investigators and by video footage from security cameras at the crime scenes, police said.
Little about Long's personal life emerged the day after the shootings; he graduated from an Atlanta-area high school in 2017 and attended a nearby Baptist church.
An inactive Instagram account that appeared to have been his bore the tagline: “Pizza, guns, drums, music, family, and God. This pretty much sums up my life,” according to The Daily Beast.
The killings marked the latest in a string of deadly mass shootings at schools, movie theatres, medical clinics and other public places in the US in recent years.
Long purchased the gun found in his car legally at Big Woods Goods in Holly Springs, Georgia, CNN reported, citing an attorney for the company.
Gun control is a divisive issue in the US, which enshrines the right to bear arms in the constitution. The US House of Representatives last week approved a pair of gun control bills as Democrats looked to a shifting political landscape they hoped would improve chances for enacting new laws after years of failed attempts.
“We are witnessing the results of what happens when racist and misogynistic ideologies collide in a society where there is also easy access to guns,” Amnesty International USA said in a statement.