Nigeria lost a diplomat in Khartoum, the capital of Sudan and the police have said that the death was as a result of a 'criminal attack'.

The Nigerian foreign ministry confirmed the death of the diplomat and described him as an “immigration attache”.

“An employee in the consular section of the Nigerian embassy was found dead at his home in Khartoum.

“Preliminary investigation shows that the death was due to a criminal act and not politically motivated,” a statement by the Sudanese police read.

There are speculations that the envoy was murdered in his official residence on Thursday, an action speculated to be an attack on migrants.

Confirming the death of the diplomat, the Nigerian foreign ministry said: “We have to wait for a formal report from our mission detailing how it happened”.

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“It is so sad and we are so worried about the incident. We are not happy about it,” Nigerian foreign ministry spokesman Tiwatope Elias-Fatile told AFP.

Reports on social media said the diplomat had been attacked with a knife, but details have not been confirmed by Sudan’s police or any official of the Nigerian government.

The Nigerian is the second diplomat to have died in Khartoum in less than a year.

In August, the then Russian ambassador to Sudan, Mirgayas Shirinsky, was found dead in the swimming pool of his residence. Moscow later said he had died of a heart attack.