Richard Ginika Izuora
The Nigerian Correctional Service has confirmed that 1,844 inmates escaped after the attack early on Monday in Owerri.
The inmates escaped from the prison after an attack by gunmen carrying rocket-propelled grenades, machine guns, explosives and rifles, the BBC reported on Tuesday.
The attackers used explosives to blast the administrative block of the prison in the southeastern town of Owerri and enter the prison yard, the BBC said.
The Nigerian Police had blamed the attack on the banned separatist group, the Indigenous People of Biafra, the BBC said.
Agence France Presse has reported that the group has denied involvement.
Several Police stations have been attacked in southeastern Nigeria since January, with large amounts of ammunition stolen since January, the BBC said.
No groups have claimed responsibility for the attacks, it said.