There was another explosion at Abolongo Correctional Centre in Oyo town, Oyo State on Wednesday afternoon.
The explosion, which occurred outside the facility recorded no casualties.
Some residents in the area suspect that the bomb was one of those planted by the gunmen who attacked the prison 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.
Recall that some gunmen invaded the facility on Friday at about 9.30 p.m. after using dynamite to blast the wall and setting all the prisoners at the facility free.
837 awaiting trial inmates escaped from the Abolongo Correctional Centre in Oyo Town, when suspected gunmen attacked the facility.
A total of 262 escaped inmates had been recaptured, while 575 were still at large.