At least 600 prisoners have escaped from a maximum-security prison in the Nigerian capital Abuja. Authorities have claimed that the extremist rebel group Boko Haram was responsible for the attack.
Shuaib Belgore, secretary of the Nigerian interior ministry said that a guard was killed when the "very determined" rebels used "high-grade explosives" to destroy the wall of the prison before gaining entry.
Gunfire and explosions were heard in Kuje, an area on the outskirts of Abuja at approximately 10pm on Tuesday.
Authorities have stated that the group that carried out the attack are part of Boko Haram, a hardline group linked to Islamic State.
The militants forced their way into the prison after blowing up the exterior wall, resulting in hundreds of their members and allies being able to flee.
Prison officials have said that so far around 300 of the escapees have been recaptured.
Mr Belgore said: "We understand they are Boko Haram. They came specifically for their conspirators.
"Right now, we have retrieved about 300 out of about 600 that got out of the jail."