Four Nigerian police officers have been arrested. They are accused of demanding money from drivers at an illegal roadblock.
The officers allegedly stopped Musa Aliyu, who leads Nigeria's anti-corruption agency. This happened while he was driving in the capital city, Abuja.
Mr. Aliyu reported the incident to the authorities.
The arrested officers are being held by the police for questioning.
An investigation into their alleged actions is underway.
This incident highlights ongoing concerns about corruption within law enforcement.