At least 25 inmates have died after clashes broke out at a jail inside a Venezuelan police station, according to a rights group.
At least 20 police officers were wounded, Una Ventana a la Libertad said.
The jail, in Acarigua, is designed to hold 250 people but currently has around 540 inmates, the Venezuelan Prison Observatory said.
It was not immediately clear what led to the violence.
Police said grenades were detonated.
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The prisons ministry told the AFP news agency that police station prisons are not under their control. It did not comment further on the incident.
Venezuela has had a number of violent prison clashes in recent years. In March 2018, 68 inmates died in a fire at a police jail.
In August 2017, at least 37 people were killed when a riot broke out in a prison in southern Venezuela.