They further stated that the traffic accident happened at approximately 21:30 local time, or 13:30 BST.
According to the news agency, a man who appeared to be in his 60s crashed the car into onlookers who were waiting at a traffic stop.
Four more persons have been admitted to the hospital at least.
Although they declare they are looking into the situation, the police issue a warning that there may be more casualties.
Before it struck any pedestrians, the car, according to the local media, was traveling in the incorrect way and collided with two other cars.
According to the police, the collision happened at a crosswalk close to Seoul City Hall. The driver in question told the police that the car abruptly accelerated, and he was arrested on the spot.
Three more people passed away later from their injuries, leaving six dead at the spot.
According to South Korea’s news agency, Yonhap, the man who was taken into custody was 68 years old.
The country’s speed limits are 30 km/h in residential zones and 50 km/h (31 mph) on broad urban routes, according to a recent Organization for Economic Co-operation and Development (OECD) assessment on road safety.
According to the agency, pedestrians in South Korea accounted for 35% of all traffic fatalities in 2022, a high percentage when compared to other OECD nations.