At least 28 people were killed and another 13 severely injured when assailants attacked a nightclub in Mexico's Gulf coast port city of Coatzacoalcos.

Local media reported men first opened fire with machine guns and then threw Molotov cocktails inside El Caballo Blanco (The White Horse) table dance bar when it was packed full of people. 

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Veracruz state police said the bar advertised "quality, security and service," private rooms for $7.50 "all night," ''sexy girls" and a pole dance contest.

Pictures on the nightclub's Facebook page showed images of dancers, customers, walls painted with nude women and "VIP rooms."

Conspiracy and corruption

President Andres Manuel Lopez Obrador addressed the issue in his daily press briefing. "The criminals went in, closed the doors, the emergency exits, and set fire to the place."

The president was critical of the handling of previous cases linked to the attack and even hinted at underhand collusion with authorities contributed to the onslaught.

"This is the most inhuman thing possible," he said. "It is regrettable that organized crime acts in this manner. It is more regrettable that there may be collusion with authorities."

Lopez Obrador added local prosecutors should be investigated because "the alleged perpetrators had been arrested, but they were freed."

Nevertheless, the attorney general's office said they were working with police to investigate and find the perpetrators.

Veracruz Governor Cuitlahuac Garcia Jimenez said that the "criminals" would not go unpunished. 

"In Veracruz, criminal groups are no longer tolerated," he wrote on Twitter.

Veracruz is one of the most violent states in Mexico with fierce fighting between criminal groups for control of drug trafficking and other criminal activities.

So far this year, more than 1,600 people have died from violence in the state, an average of seven deaths per day.

Some local media likened the attack to one in 2011 on a bar in Monterrey that killed 52 people.

The Zetas drug cartel carried out that attack using fire and guns to enforce demands for protection payments.

cw, jsi/sms (AP, EFE, Reuters)

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