All 64 suspected Boko Haram commanders and men were among the 416 inmates that escaped from the Kuje Correctional Centre in Abuja following the Tuesday night attack.
Four inmates and an operative of the Nigerian Security and Civil Defence Corps (NSCDC) were killed.
The Islamic State of West Africa Province (ISWAP) last night claimed responsibility.
Permanent Secretary in the Ministry of Interior Dr. Shuaib Belgore spoke on how the terrorists invaded the facility.
According to him, the assailants came determined as they fought security operatives for over 30 minutes.
He said reinforcement was called but the terrorists escaped before support arrived.
Minister of Defence, Maj.- Gen. Bashir Magashi, added that the attack pattern pointed to Boko Haram insurgents.
According to him, the insurgents came in large numbers and attacked the facility at about 10.25pm.
He said all security personnel within the facility responded in equal measure to the attackers.
He said: “From the records, they belong to a particular group – the Boko Haram insurgent group. And all of them inside the facility have escaped.”
Inspector-General (IG) Usman Alkali ordered the deployment of the Explosives Ordnance Disposal (EOD) Unit, forensic experts and other special forces to the Centre.
Police Spokesman, Muyiwa Adejobi, said all relevant security agencies were working to unravel the circumstances surrounding the breach.
Former Minister of Interior Lt.-Gen Abdulrahaman Dambazau said last night on television that many of the Boko Haram commanders in the facility had been there for 10 years.
He added that he was told that those men were undergoing deradicalisation being coordinated by the office of the National Security Adviser (NSA).
Gen. Dambazau insisted that people must be held accountable for the attack.
He accused security agencies of working at cross purposes, claiming that since there was an intelligence report of an impending attack on the facility, it should have been foiled.
It occurred on the same day President Muhammadu Buhari’s advance security team was attacked in Katsina.
Buhari disappointed with intelligence failure
President Muhammadu Buhari, who visited the Centre, slammed the failure of intelligence.
He directed the authorities to provide him with a comprehensive report.
The President was briefed by the Permanent Secretary, Ministry of Interior, Dr. Shuaib Belgore and the Controller General of Nigerian Correctional Service, Haliru Nababa.
He was shown the bombed-out section and the records office that was set ablaze.
Dr Belgore said the invaders launched an attack on all cells in which Boko Haram terrorists were held.
The President was informed that none of the 63 terrorists could be accounted for, but that there were backup records.
President Buhari asked: “How did the defences at the prison fail to prevent the attack? How many inmates were in the facility? How many of them can you account for?
“How many personnel did you have on duty? How many of them were armed? Were there guards on the watchtower? What did they do? Does the CCTV work?”
After inspecting some of the points impacted by the attack, President Buhari spoke to reporters, expressing disappointment with the intelligence system.
“I am disappointed with the intelligence system. How can terrorists organise, have weapons, attack a security installation and get away with it?”
The President, accompanied by Secretary to the Government of the Federation Boss Mustapha and Chief of Staff Prof Ibrahim Gambari, said he expected “a comprehensive report” on the incident.
NCoS spokesman, Mr Abubakar Umar, said the Centre has a capacity of about 940 inmates, but 994 inmates were in the facility when the terrorists struck.
According to him, the 443 who escaped have been recaptured, bringing the number of inmates in the facility to 578.
Among those who escaped, Umar said, are 64 suspected Boko Haram members, which brings to 416 the number of inmates on the run.