The death of a Korean policeman who was on a police mission in Afghanistan was the latest in a series of killings that have prompted the police union to launch an investigation into the killings.
The police union has said the deaths were a case of mistaken identity.
Police Chief Park Chung-hee said police officers should be able to defend themselves if they are attacked by other officers.
The killings prompted the government to declare a nationwide nationwide state of emergency and to launch the “National Guard of Safety” to help curb the growing number of violent attacks on police.
In a statement, Park said the killing of the police officer would be investigated by a separate commission.
Park said he had instructed the police to submit a detailed report within three days of the killing.
The police will be able only to make public statements on the matter after that.
The statement said the investigation was in its final stages.
The killing of a policeman was one of the few incidents that prompted the suspension of a police chief who oversaw the recruitment of more than 100,000 recruits in the past year.