There was another explosion at Abolongo Correctional Centre in Oyo town, Oyo State on Tuesday afternoon.
SaharaReporters reports that the explosion, which occurred outside the facility recorded no casualties.
Some residents in the area suspected that the explosion could have been caused by one of the bombs planted by the gunmen who attacked the facility last Friday.
It is suspected that it did not detonate at the time.
Security operatives have paid a visit to the scene to assess the extent of the damage.
Some gunmen had attacked the facility on Friday, setting all the prisoners at there free.
The attackers had stormed the facility around 10pm.