QUITO—At least 58 prisoners were killed and a dozen injured in overnight violence at Ecuador’s Penitenciaria del Litoral prison, the government said on Saturday, in what has been characterized as fighting between gangs. The penitentiary, located in the southern city of Guayaquil, is the same prison where 119 inmates were killed in late September in the country’s worst-ever incident of prison violence. The government has blamed disputes between drug trafficking gangs for control of prisons for the violence. The latest disturbance was set off by a power vacuum following a gang leader’s release, governor of Guayas province Pablo Arosemena said in a press conference. “The context of this situation is that there was no leader of the gang that has this cell block because a few days ago that prisoner was released … for completing 60 percent of his sentence,” Arosemena said. “Other cell blocks with other groups wanted to …