At least one gunman killed eight people at three Atlanta-area massage parlors Tuesday and police say they are trying to determine a motive for the brazen attacks.

Hours after the killings, a 21-year-old man was captured in southwest Georgia. Cherokee County sheriff’s Capt. Jay Baker said Robert Aaron Long of Woodstock, Georgia, was taken into custody in Crisp County on Tuesday night, about 150 miles south of Atlanta.

Baker said they believe Long is the suspect in all three shootings.

The Atlanta Police Department responded to calls of a robbery in progress shortly before 6 p.m. Tuesday, Sergeant John Chafee said in an emailed statement to USA TODAY. Police found three women dead when they arrived at the scene.

While police were at the first scene, they received calls regarding shots fired across the street, Chafee said. They responded and found another woman who had been fatally shot inside a massage parlor.

Around 5 p.m., five people were shot at Young’s Asian Massage Parlor in Acworth, about 30 miles north of Atlanta, Baker said. Two of the victims were dead and three were transported to a hospital where two of them also died, Baker said. The Cherokee Sheriff’s Office released a photo of a suspect on Facebook Tuesday evening.

The victims in the Acworth shooting were two Asian women, a white woman and a white man, Baker told the Atlanta Journal Constitution. The fifth victim was a Hispanic man who was injured and taken to the hospital.