The authorities are already investigating what led to the death of the unnamed diplomat.
According to a report by Reuters, two security sources said the authorities are already investigating what led to the death of the unnamed diplomat.
The report also noted that Dubai-based al-Arabiya television identified the deceased as the consul general and described his death as an "assassination". Reports on the internet have also suggested he was killed with a knife by his attackers.
Nigeria's Ministry of Foreign Affairs has confirmed the death of the diplomat, identifying him as Habibu Almu, a Nigerian Immigration attache at the Nigerian Mission in Khartoum, Sudan.
Spokesperson of the ministry, Tope Elias-Fatile, told the News Agency of Nigeria, "The Ministry has received the sad news of the untimely death of the Immigration Attache in our Mission in Khartoum, Sudan.
"We are awaiting further and detailed report from the Mission after which a statement would be issued."