Some 240 prisoners have escaped after unidentified gunmen attacked a facility in Nigeria’s Kogi State, officials say.
It is the second mass jailbreak this year in Nigeria, which is struggling with multiple security crises.
According to Reuters, the attackers breached the prison’s perimeter fence to gain entry.
According to the Nigerian prison service, the gunmen were heavily armed and engaged in a gun battle with the guards.
Two security officers were killed at the Security Custodial Centre in Kabba, according to eyewitnesses, but this has not been officially confirmed.
Authorities say they are conducting investigations to find the escaped prisoners and the gunmen who freed them.
The medium-security prison, which is located on the main road connecting Kabba and Lokoja, housed a total of 294 prisoners. The vast majority of them were being held in pre-trial detention.
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Boko Haram, an Islamist militant group, has raided prisons several times in recent years to free inmates.
Many of the inmates in Kabba are suspected Boko Haram fighters, but authorities say it is still unclear who was behind the jailbreak on Sunday.
In April more than 1,800 inmates were freed by gunmen who ambushed Owerri police headquarters, in south-eastern Nigeria. Police blamed that attack on a banned separatist group.