According to GMA News, a riot erupted earlier on 9 November due to a confrontation between two groups. The riot was suppressed after a few hours and the authorities are investigating the circumstances of the incident.
Photos of the Philippine police force reportedly entering the prison have emerged online.
The Ministry of Justice noted the investigation will also focus on identifying negligence among the employees of the country's Bureau of Corrections.
On 9 October, this prison was hit by another riot that resulted in the killing of nine people.
The media previously reported that over 28,000 inmates are currently imprisoned there despite the correctional facility only being designed for 3,000 people.