But police investigations uncovered a shocking twist—the threatening message was allegedly sent by an inmate inside Oko Correctional Centre. The Federal Government recently sanctioned 147 Nigerian Correctional Service (NCoS) officers over contraband-related offences and destroyed 1,167 mobile phones recovered from prisons nationwide. Authorities said the phones, SIM cards and cash were being used by inmates to run criminal operations from behind bars. Although the Nigerian Correctional Service denied the claims, the allegations sparked nationwide outrage. Authorities said the phones, SIM cards and cash were being used by inmates to run criminal operations from behind bars.Several high-profile cases have fueled public concern.