The perimeter of the Granja Penal Canada facility has been surrounded by army and police officers, Sosa said, adding that authorities had avoided entering the prison Sunday when the fight broke out amid reports that several inmates were carrying firearms.
The decision was meant to mitigate risk to security forces and other inmates, he said.
Czechs under fire for harsh, lengthy migrant detentions
"We are coordinating an investigation into the death of 16 inmates with prosecutors," Sosa told journalists, adding that the fight was believed to be due to a clash between rival gangs.
The maximum security prison is home to nearly 3,100 detainees and is located just 75 kilometers (47 miles) south of Guatemala City.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ