Police said they took someone into custody shortly after the shooting on Rainier Avenue South.
One person was fatally shot late Saturday in South Seattle, and police quickly said they had a suspect in custody.
The shooting occurred after 9:30 p.m. at Rainier Avenue South and South Dearborn Street. The victim was taken to Harborview Medical Center, but it was not clear from police late Saturday whether the person died at the hospital.
People at the shooting scene said two men had been arguing in a gas-station parking lot before the shots were fired.