Police commander Tannya Varela said there was a shootout between inmates at the prison in Guayaquil.
Officers neutralised the confrontation and maintained control of the prison, the police force said.
Military, elite police cooperate
Elite police teams entered the facility, supported by soldiers and a military tank, according to video released by the force.
Two rifles, three pistols, ammunition and cell phones were seized in the prison, police said.
The jail has space for 5,300 inmates, but it houses 8,500 — 60 percent more than capacity.
On Tuesday, at least 118 inmates were killed, six of them beheaded, as rival gangs armed with guns and grenades went to war at the prison.
Another 86 wounded were wounded, six critically, according to Ecuador’s prisons authority.
It was the latest in a string of bloody clashes in Ecuador’s broken prison system, with 237 inmates killed so far this year – up from 103 in 2020.
Clashes in Ecuador prisons
Ecuador on Friday deployed thousands of police and soldiers to secure its prisons, in an attempt to prevent further clashes.
The prison system has 65 facilities designed for about 30,000 inmates but houses 39,000.
The country has about 1,500 guards, a shortfall of about 3,000, according to experts.
At a neighbouring prison on Saturday, inmates climbed up to the rooftops to wave white clothing and display signs calling for peace, AFP saw.
The inmates held up signs that read “We want peace” and “The law is killing us.”
They have asked not to be transferred to other prisons because “there are no problems” in their current institution.
Authorities are planning to relocate some of the Guayaquil prisoners after the riot, as relatives of the inmates continue to gather outside the complex, begging for information about their family members.
So far, 101 bodies have been identified, 44 of which have been given to their families, police said.