Prison guards apparently let inmates who belonged to the brutal Los Zetas gang bludgeon to death scores of rivals from the Gulf Cartel during a weekend riot, while other Zetas gangsters fled the prison, Gov. Rodrigo Medina of Nuevo Leon state said Monday.
Medina said 30 inmates, some of them senior Zetas gangsters, escaped the Apodaca prison, probably using Sunday's predawn melee as cover.
There were no signs that the fleeing inmates had escaped over prison walls or through tunnels, Medina said, indicating that they simply walked out the gates.
"Unfortunately, a group of traitors has set back the work of a lot of good police," Medina said during a news conference in Monterrey, the capital of Nuevo Leon.
Medina fired the prison's warden, his deputy and the state's director of penitentiaries. Authorities also detained for questioning the 18 guards who were on duty at the time.
Among the gangsters who escaped was Oscar Manuel "The Spider" Bernal Soriano, who was the Zetas boss in Monterrey, Mexico's third largest city, at the time of his capture in October 2010
Medina said all 30 of the escapees were Zetas. He offered a reward of 10 million pesos -- about $787,000 -- for information that leads to their recapture.
The prison melee began at about 2 a.m. Sunday, when Zetas inmates wielding clubs, rocks and makeshift knives attacked a cellblock that housed members of the Gulf Cartel, stabbing and bludgeoning them to death. At least one man reportedly was beheaded. All the victims belonged to the Gulf Cartel, Medina said.
Soldiers arrived at the prison and quelled the riot within two hours.
One Monterrey human rights advocate said prison guards appeared to let the vengeance slayings occur. Sister Consuelo Morales, a nun who heads Citizens in Support of Human Rights, told the Milenio television network that some of the slain inmates were disfigured. "Some of them no longer had eyes," she said.
Like prisons around much of Latin America, the Apodaca jail was overcrowded, holding 2,514 inmates, well above its maximum capacity of 1,522.
A fire broke out six days earlier in an overcrowded Honduran prison, leading to the deaths of 359 inmates in the worst prison tragedy ever in Latin America.