A journalist whose undercover stories exposed the depth of corruption in Nigerian police cells and prison may be arrested by the Nigerian authorities.

The first instalment of the three-part investigation by Fisayo Soyombo, a former editor of The Cable and a contributor to Al Jazeera, detailed how Nigerian policemen “pervert the course of justice in their quest for ill-gotten money”.

In the second part of the investigation published on Monday by The Cable, he exposed “how the courts short-change the law, and the prisons are themselves a cesspool of the exact reasons for which they hold inmates.”

During his investigation, Soyombo took on an alias – Ojo Olajumoke – spent five days in a cell at Pedro Police Station, Shomolu, Lagos. And eight days in Ikoyi prison.

The Guardian learned that it is the second part of Soyombo’s story that has irked the Nigerian prison authorities, especially the comptroller-general of the prison services.

A security source told The Guardian on Tuesday morning that Soyombo, scheduled to speak at a workshop on fake news organised by Goethe Institute on Tuesday evening, is to be arrested at the venue of the event. He has since pulled out of the event.

“Prisons authorities are very angry and have decided to get the journalist arrested,” the source said.

“He is to be charged to court and prosecuted under Section 29 of the Nigeria Correctional Service Act.”

Another source told The Guardian on Monday that Soyombo has been forced to vacate his residence for which he has just renewed rent and has gone underground.

The hounding and the outright assassination of journalists who exposed the official corruption in Nigerian are rampant.

Agba Jalingo, a journalist and publisher of an online newspaper CrossRiverWatch, is currently in jail and facing allegations of treason after he published a story on alleged diversion of N500 million by the Cross River governor, Ben Ayade.

Another journalist Jones Abiri is also facing prosecution under Nigeria’s cybercrimes act, anti-sabotage act, and terrorism prevention act for crimes allegedly carried out in 2016.

Abiri was held by Nigeria’s secret police without any charge between July 2016 to August 2018. He was rearrested nine months after he was freed by the Department of State Services.