Officials in Nigeria say dozens of Boko Haram suspects are missing after a prison in the capital, Abuja, was attacked by armed men on Tuesday night.
The authorities have not said the total number of inmates who are on the run.
Witnesses described hearing loud explosions and gunfire around the Kuje prison.
The security forces said they later retook control of the facility.
Islamist militants have carried out several jailbreaks across Nigeria in recent years.
Other armed criminal gangs have also carried out similar attacks.
More than 5,000 inmates have escaped since 2020.
Hours before the latest prison attack, gunmen opened fire on a presidential in the north of the country. President Muhammadu Buhari was not in any of the vehicles.
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