"The three people it came from North Korea, rather than from South Korea," said the head of the regional police, Rufa'i, Yobe State Sanusi told AFP about the attack, which took place in the restive area of Potiskum.
"They are the doctors who work in Potiskum to State Governments," he added.
Abdullahi, spokesman for the Governor of the Dingle area of Yobe State, also identifies the sacrifices as citizens of North Korea and say, they were in Nigeria as part of an agreement of cooperation was signed about five years ago.
According to police, people armed with knives slit the third doctor was in a offensive towards dawn, the last such killings in the past few months.
Police had earlier identified the victim as Chinese, then South Korea, before finally saying that they came from North Korea.
The North Korea Embassy officials could not be reached for comment about the attacks they requested it.
In November, gunmen shot dead two Chinese building workers in the State of Borno, the adjacent headquarters of the hard-line group Boko Haram.
Three others also killed Chinese in separate attacks in the area.
Some Nigerians also became a victim of gorok the neck in that area in the past few months.
Although there has been no parties who claim to be responsible, the attacks were similar to those performed by the Boko Haram before against foreigners.
Violence escalates in Nigeria since the attacks killed dozens of people during Christmas celebrations 2011 which was claimed by hardline muslim group Boko Haram.
Kano, the city has a population of about 10 million people in Northern Nigeria, a region which was hit hardest in the violence.
A series of bombings and shootings swept Kano after Friday prayers on January 20, 2012, killing 185 people, in attacks claimed by Boko Haram which aimed at the police headquarters and the offices of other policemen, a police building and immigration offices.
The attacks were the most deadly operations by the Group and is aimed primarily at the police station.
Boko Haram claimed dozens of attacks in Nigeria, including suicide bombings in August at UN headquarters in Abuja that killed at least 24 people.
A series of bomb attacks in the city of Jos, central Nigeria, on Christmas Eve 2010 also claimed by Boko Haram.
Boko Haram launched a violent action in 2009 that the uprising was crushed brutally by the military which killed about 800 people and destroying mosques and their headquarters in the northeastern city of Maiduguri, Nigeria.
The Group was inactive for about a year and then appeared again in 2010 with a series of murders.
Nigeria's population of over 160 million people split in the northern region, which is mostly Muslim and the South largely Christian. (M014)
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