Three doctors killed in a knife attack in northeastern Nigeria on Sunday were North Koreans, police and the state government said, after earlier confusion over the victims' nationalities.
"The three men were from North Korea and not South Korea," Yobe state police commissioner Sanusi Rufa'i told AFP of the attack in the restive city of Potiskum.
"They were doctors working in Potiskum on behalf of the state government."
Abdullahi Bego, spokesman for the Yobe state governor, also identified the victims as North Koreans and said they were in Nigeria as part of a cooperation agreement signed some five years ago.
Men armed with knives slit the throats of the three doctors in a pre-dawn attack, police said, in the latest such killings in recent months.
Police initially identified the victims as Chinese, then South Koreans, before finally saying they were from North Korea.
North Korean embassy officials could not immediately be reached for comment.