Nigeria, May 16 -- The Nigerian Army has provided details of how Abubakar Mainok, a top Islamic State commander, was killed in a rare joint military operation with United States forces.

The army said the operation was conducted by troops of Operation Hadin Kai (OPHK), a joint task force in the North-east, and the United States Africa Command (AFRICOM).

According to a statement by Sani Uba, the spokesperson for the task force, Mr Mainok was killed during a "meticulously planned and highly complex precision air-land operation" at Metele, a Borno village bordering Nigeria and Niger in the Lake Chad area.

Earlier, US President Donald Trump announced the killing of Mr Mainok, describing him as the "second-in-command" of the Islamic State in...