In a Friday night attack, unknown gunmen freed all inmates of a correctional facility in Abolongo area in Oyo, Oyo State.
Prisons are called correctional centres in Nigeria. Over 1,000 prisoners were said to have been freed by the attackers.
According to sources, gunmen stormed the facility late on Friday night, attacking with grenades to gain access and set the prisoners free.
It was further learnt that the attack left the facility in disarray with warders scampering for safety.
Meanwhile, operatives of various security agencies are said to have been mobilised to track down fleeing prisoners.