MONTERREY, Feb. 11, 2016 (Xinhua) -- Security elements guard the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- Family members of inmates wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- Family members of inmates wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- Elements of the Mexican Army arrive to the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/Str)

MONTERREY, Feb. 11, 2016 (Xinhua) -- Family members of inmates wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- The family member of an inmate waits for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- The family member of an inmate reacts as residents wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- The family member of an inmate reacts as residents wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- Family members of inmates wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC)

MONTERREY, Feb. 11, 2016 (Xinhua) -- Family members of inmates argue with security elements as they wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC) 10

MONTERREY, Feb. 11, 2016 (Xinhua) -- A woman asks family members of inmates to keep calm as they wait for information outside the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC) 11

MONTERREY, Feb. 11, 2016 (Xinhua) -- Security elements guard the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC) 12

MONTERREY, Feb. 11, 2016 (Xinhua) -- Security elements guard the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/ABC) 13

MONTERREY, Feb. 11, 2016 (Xinhua) -- An inmate is seen at the Topo Chico prison, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed a press conference that 52 people were killed and 12 injured after a fight broke out between two rival fractions of inmates inside the Topo Chico prison. (Xinhua/Str) 14

MONTERREY, Feb. 12, 2016 (Xinhua) -- Family members, residents and members of the press wait for information outside of the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed in a press conference that 52 people were killed and 12 injured after a fight between two rival fractions of inmates broke in the Topo Chico prison. (Xinhua/Str) 15

MONTERREY, Feb. 12, 2016 (Xinhua) -- Family members of inmates and residents wait for information outside of the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed in a press conference that 52 people were killed and 12 injured after a fight between two rival fractions of inmates broke in the Topo Chico prison. (Xinhua/Str) 16

MONTERREY, Feb. 12, 2016 (Xinhua) -- Security elements guard the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed in a press conference that 52 people were killed and 12 injured after a fight between two rival fractions of inmates broke in the Topo Chico prison. (Xinhua/Str) 17

MONTERREY, Feb. 12, 2016 (Xinhua) -- Security elements speak to family members of inmates and residents that wait for information outside the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed in a press conference that 52 people were killed and 12 injured after a fight between two rival fractions of inmates broke in the Topo Chico prison. (Xinhua/Str) 18

MONTERREY, Feb. 12, 2016 (Xinhua) -- Family members of inmates and residents wait for information outside of the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed in a press conference that 52 people were killed and 12 injured after a fight between two rival fractions of inmates broke in the Topo Chico prison. (Xinhua/Str) 19

MONTERREY, Feb. 12, 2016 (Xinhua) -- Family members of inmates and residents wait for information outside of the Topo Chico prison after a fight between inmates, in Monterrey, in the state of Nuevo Leon, Mexico, on Feb. 11, 2016. Jaime Rodriguez Calderon, governor of Nuevo Leon, informed in a press conference that 52 people were killed and 12 injured after a fight between two rival fractions of inmates broke in the Topo Chico prison. (Xinhua/Str) 20