Eight people were killed Tuesday night in three shootings at Atlanta-area massage parlors, and police arrested a 21-year-old man suspected of being the lone gunman.

Atlanta police responded to calls for a robbery in progress shortly before 6 p.m. Tuesday, Atlanta Police Department Sgt. John Chafee said, and found three women dead at the Gold Spa. While still on scene, police received calls for shots fired across the street at another massage parlor, where they found another woman fatally shot.

About an hour earlier, some 30 miles north of Atlanta, five people were shot at another massage parlor, Cherokee County Sheriff’s Office spokesman Capt. Jay Baker said. Two of the victims were dead at the scene. Three were transported to a hospital, where two of them also died, Baker said.

Video evidence “suggests it is extremely likely” the suspect is the same in each attack, Chafee said in an emailed statement.

“Many have asked whether these shootings are related to Cherokee County’s shootings,” Chafee said. “Video footage from our Video Integration Center places the Cherokee County suspect’s vehicle in the area, around the time of our Piedmont Road shootings.

That, along with video evidence viewed by investigators, suggests it is extremely likely our suspect is the same as Cherokee County’s, who is in custody.”