Lagos State Police Command has arrested the four policemen who killed two suspected phone thieves in broad daylight in the Igando area of the state.
Police spokesman, Bala Elkana, said they would face murder charges.
A viral video had surfaced on the social media on Tuesday, showing the officers manhandling, and, later, ultimately killed the suspects.
Elkana identified the policemen as Inspector Fabiyi Omomayara, Sergeant Olaniyi Solomon, Sergeant Solomon Sunday and Corporal Aliyu Mukaila; adding that they were attached to the Iba Police Division and not the Special Anti-Robbery Squad.
The men had been filmed shooting dead the suspects after they were arrested for allegedly robbing people who sold phones on Jiji, an online sales platform.
The Police said the action of the cops violated the code of conduct of the Force.
Elkana added that the state Commissioner of Police, CP Zubairu Muazu, had ordered a thorough investigation into the incident.
He said the Police officers were being subjected to internal disciplinary proceedings, noting that if found culpable, they would be dismissed from the Force and handed over to the State Criminal Investigation and Intelligence Department, Yaba, for prosecution.