The officer, Inusa Saidu Biu, made the statement in a Facebook post on Tuesday, April 25.
The Nigeria Police Force had in a statement on Wednesday said it is investigating matter.
In the post, Biu claimed that the 'enemies' of the President are orchestrating his (Buhari) death.
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He wrote, "After they poisoned him, God did not let him die; Buhari, the cat with nine lives. Now they want him to resign so that they would continue to steal our ‘yam’ (treasury). No way; your enemies will die like mosquitoes before you, including those who are commenting negatively. Shege ya buro uba, Zamu ci uwaku. If Buhari dies, I promise to kill 200 people."
The post, which went viral, sparked outrage on the internet, with many calling for the immediate arrest of the policeman.
Reacting to the post, the Force Public Relations Officer, CSP Moshood Jimoh, said the police headquarters is aware of the situation.
He said the police has commenced an investigation to first determine if Biu is indeed a policeman.
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"We have seen the post and we are investigating it. Anybody can post anything on the social media. We first need to ascertain if that man is a policeman and the necessary procedure will be taken. A policeman should not make public comment on social issues. We are investigating and will make the findings public very soon."
In the past few days, multiple reports have indicated that Buhari's health condition may have worsened.
This has been fueled by the President's absence at major official activities, including the Federal Executive Council (FEC) meetings.
