68 people are dead after a fire broke out at a police station in the Venezuelan city of Valencia, in Carabobo state.
The fire reportedly started after prisoners set fire to mattresses in an attempt to break out on Wednesday.
Chief state prosecutor Tarek Saab said an investigation into what had happened would begin immediately.
He said nearly all of those who died were inmates but at least two women who were visiting at the time were also killed.
Mr Saab added that some of the victims burned to death, while others died of smoke asphyxiation.
State official Jesus Santander said the state of Carabobo was in mourning but said the situation had now been brought under control.
Mr Santander confirmed that one police officer had been shot before the fire broke out.
Rescuers reportedly broke through walls to try to free those trapped by the blaze.
Police then used tear gas to disperse relatives who surrounded the station after news of the fire broke.