Four high-profile inmates including Jaybee Sebastian and Peter Co were hurt in a stabbing incident inside Building 14 of the New Bilibid Prison (NBP) on Wednesday morning.
Justice Secretary Vitaliano Aguirre II said the stabbing incident happened at around 7:40 a.m.
Aguirre identified the two other high-profile inmates hurt in the incident as Tony Co and Vicente Sy.
He said the injured inmates have been rushed to the hospital.
"May namatay na ata," the Justice secretary said.
Building 14 houses high-profile inmates, including top drug lords.
Sebastian, an alleged drug lord and gang leader, had been invited to attend the House of Representatives Committee on Justice hearing on the alleged drug trade in the NBP.
Aguirre had said that they will soon file charges against Sen. Leila de Lima, the former secretary of the Department of Justice, for her alleged involvement in the drug trade at the national penitentiary.